Human impact on the environment (or anthropogenic environmental impact) refers to changes to biophysical environments^[14] and to ecosystems, biodiversity, and natural resources^[15] caused directly or indirectly by humans. Modifying the environment to fit the needs of society (as in the built environment) is causing severe effects^[16][17] including global warming,^[14][18][19] environmental degradation^[14] (such as ocean acidification^[14][20]), mass extinction and biodiversity loss,^{[21][22][23][24]} ecological crisis, and ecological collapse. Some human activities that cause damage (either directly or indirectly) to the environment on a global scale include population growth,^[25][26][27] neoliberal economic policies^[28][29][30] and rapid economic growth,^[31] overconsumption, overexploitation, pollution, and deforestation^[32]. Some of the problems, including global warming and biodiversity loss, have been proposed as representing catastrophic risks to the survival of the human species.^[33][34]

The term anthropogenic designates an effect or object resulting from human activity. The term was first used in the technical sense by Russian geologist Alexey Pavlov, and it was first used in English by British ecologist Arthur Tansley in reference to human influences on climax plant communities.^[35] The atmospheric scientist Paul Crutzen introduced the term "Anthropocene" in the mid-1970s.^[36] The term is sometimes used in the context of pollution produced from human activity since the start of the Agricultural Revolution but also applies broadly to all major human impacts on the environment.^[37][38][39] Many of the actions taken by humans that contribute to a heated environment stem from the burning of fossil fuel from a variety of sources, such as: electricity, cars, planes, space heating, manufacturing, or the destruction of forests.^[40]

Pollution is the introduction of contaminants into the natural environment that cause harm.^[41] Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.

Although environmental pollution can be caused by natural events, the word pollution generally implies that the contaminants have a human source, such as manufacturing, extractive industries, poor waste management, transportation or agriculture. Pollution is often classed as point source (coming from a highly concentrated specific site, such as a factory, mine, construction site), or nonpoint source pollution (coming from a widespread distributed sources, such as microplastics or agricultural runoff).

Many sources of pollution were unregulated parts of industrialization during the 19th and 20th centuries until the emergence of environmental regulation and pollution policy in the later half of the 20th century. Sites where historically polluting industries released persistent pollutants may have legacy pollution long after the source of the pollution is stopped. Major forms of pollution include air pollution, water pollution, litter, noise pollution, plastic pollution, soil contamination, radioactive contamination, thermal pollution, light pollution, and visual pollution.^[42]

Pollution has widespread consequences on human and environmental health, having systematic impact on social and economic systems. In 2019, pollution killed approximately nine million people worldwide (about one in six deaths that year); about three-quarters of these deaths were caused by air pollution.^[43][44] A 2022 literature review found that levels of anthropogenic chemical pollution have exceeded planetary boundaries and now threaten entire ecosystems around the world.^[45][46] Pollutants frequently have outsized impacts on vulnerable populations, such as children and the elderly, and marginalized communities, because polluting industries and toxic waste sites tend to be collocated with populations with less economic and political power.^[47] This outsized impact is a core reason for the formation of the environmental justice movement,^[48][49] and continues to be a core element of environmental conflicts, particularly in the Global South.

Because of the impacts of these chemicals, local and international countries' policy have increasingly sought to regulate pollutants, resulting in increasing air and water quality standards, alongside regulation of specific waste streams. Regional and national policy is typically supervised by environmental agencies or ministries, while international efforts are coordinated by the UN Environmental Program and other treaty bodies. Pollution mitigation is an important part of all of the Sustainable Development Goals.^[50]

 

Environmental degradation is the deterioration of the environment through depletion of resources such as quality of air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable.^[51][52] The environmental degradation process amplifies the impact of environmental issues which leave lasting impacts on the environment.^{[citation needed]}

Environmental degradation is one of the ten threats officially cautioned by the High-level Panel on Threats, Challenges and Change of the United Nations. The United Nations International Strategy for Disaster Reduction defines environmental degradation as "the reduction of the capacity of the environment to meet social and ecological objectives, and needs".^[53]

Environmental degradation comes in many types. When natural habitats are destroyed or natural resources are depleted, the environment is degraded; direct environmental degradation, such as deforestation, which is readily visible; this can be caused by more indirect process, such as the build up of plastic pollution over time or the buildup of greenhouse gases that causes tipping points in the climate system. Efforts to counteract this problem include environmental protection and environmental resources management. Mismanagement that leads to degradation can also lead to environmental conflict where communities organize in opposition to the forces that mismanaged the environment.

 

Environmental conflicts, socio-environmental conflict or ecological distribution conflicts (EDCs) are social conflicts caused by environmental degradation or by unequal distribution of environmental resources.^[54][55][56] The Environmental Justice Atlas documented 3,100 environmental conflicts worldwide as of April 2020 and emphasised that many more conflicts remained undocumented.^[54]

Parties involved in these conflicts include locally affected communities, states, companies and investors, and social or environmental movements;^[57][58] typically environmental defenders are protecting their homelands from resource extraction or hazardous waste disposal.^[54] Resource extraction and hazardous waste activities often create resource scarcities (such as by overfishing or deforestation), pollute the environment, and degrade the living space for humans and nature, resulting in conflict.^[59] A particular case of environmental conflicts are forestry conflicts, or forest conflicts which "are broadly viewed as struggles of varying intensity between interest groups, over values and issues related to forest policy and the use of forest resources".^[60] In the last decades, a growing number of these have been identified globally.^[61]

Frequently environmental conflicts focus on environmental justice issues, the rights of indigenous people, the rights of peasants, or threats to communities whose livelihoods are dependent on the ocean.^[54] Outcomes of local conflicts are increasingly influenced by trans-national environmental justice networks that comprise the global environmental justice movement.^[54][62]

Environmental conflict can complicate response to natural disaster or exacerbate existing conflicts – especially in the context of geopolitical disputes or where communities have been displaced to create environmental migrants.^[63][56][59] The study of these conflicts is related to the fields of ecological economics, political ecology, and environmental justice.

Environmental justice is a social movement that addresses injustice that occurs when poor or marginalized communities are harmed by hazardous waste, resource extraction, and other land uses from which they do not benefit.^[64][65] The movement has generated hundreds of studies showing that exposure to environmental harm is inequitably distributed.^[66] Additionally, many marginalized communities, including the LGBTQ community, are disproportionately impacted by natural disasters.

The movement began in the United States in the 1980s. It was heavily influenced by the American civil rights movement and focused on environmental racism within rich countries. The movement was later expanded to consider gender, LGBTQ people, international environmental injustice, and inequalities within marginalized groups. As the movement achieved some success in rich countries, environmental burdens were shifted to the Global South (as for example through extractivism or the global waste trade). The movement for environmental justice has thus become more global, with some of its aims now being articulated by the United Nations. The movement overlaps with movements for Indigenous land rights and for the human right to a healthy environment.^[67]

 

The goal of the environmental justice movement is to achieve agency for marginalized communities in making environmental decisions that affect their lives. The global environmental justice movement arises from local environmental conflicts in which environmental defenders frequently confront multi-national corporations in resource extraction or other industries. Local outcomes of these conflicts are increasingly influenced by trans-national environmental justice networks.^[68][69]

Environmental justice scholars have produced a large interdisciplinary body of social science literature that includes contributions to political ecology, environmental law, and theories on justice and sustainability.^[65][70][71]

Environmental laws are laws that protect the environment.^[73] The term "environmental law" encompasses treaties, statutes, regulations, conventions, and policies designed to protect the natural environment and manage the impact of human activities on ecosystems and natural resources, such as forests, minerals, or fisheries. It addresses issues such as pollution control, resource conservation, biodiversity protection, climate change mitigation, and sustainable development. As part of both national and international legal frameworks, environmental law seeks to balance environmental preservation with economic and social needs, often through regulatory mechanisms, enforcement measures, and incentives for compliance.

The field emerged prominently in the mid-20th century as industrialization and environmental degradation spurred global awareness, culminating in landmark agreements like the 1972 Stockholm Conference and the 1992 Rio Declaration. Key principles include the precautionary principle, the polluter pays principle, and intergenerational equity. Modern environmental law intersects with human rights, international trade, and energy policy.

Internationally, treaties such as the Paris Agreement (2015), the Kyoto Protocol (1997), and the Convention on Biological Diversity (1992) establish cooperative frameworks for addressing transboundary issues. Nationally, laws like the UK's Clean Air Act 1956 and the US Toxic Substances Control Act of 1976 establish regulations to limit pollution and manage chemical safety. Enforcement varies by jurisdiction, often involving governmental agencies, judicial systems, and international organizations. Environmental impact assessments are a common way to enforce environmental law.

Challenges in environmental law include reconciling economic growth with sustainability, determining adequate levels of compensation, and addressing enforcement gaps in international contexts. The field continues to evolve in response to emerging crises such as biodiversity loss, plastic pollution in oceans, and climate change.

Environmental impact assessment (EIA) is the assessment of the environmental consequences of a plan, policy, program, or actual projects prior to the decision to bb forward with the proposed action. In this context, the term "environmental impact assessment" is usually used when applied to actual projects by individuals or companies and the term "strategic environmental assessment" (SEA) applies to policies, plans and programmes most often proposed by organs of state.^[74][75] It is a tool of environmental management forming a part of project approval and decision-making.^[76] Environmental assessments may be governed by rules of administrative procedure regarding public participation and documentation of decision making, and may be subject to judicial review.

The purpose of the assessment is to ensure that decision-makers consider the environmental impacts when deciding whether or not to proceed with a project. The International Association for Impact Assessment (IAIA) defines an environmental impact assessment as "the process of identifying, predicting, evaluating and mitigating the biophysical, social, and other relevant effects of development proposals prior to major decisions being taken and commitments made".^[77] EIAs are unique in that they do not require adherence to a predetermined environmental outcome, but rather they require decision-makers to account for environmental values in their decisions and to justify those decisions in light of detailed environmental studies and public comments on the potential environmental impacts.^[78]

 

The environmental movement (sometimes referred to as the ecology movement) is a social movement that aims to protect the natural world from harmful environmental practices in order to create sustainable living.^[79] In its recognition of humanity as a participant in (not an enemy of) ecosystems, the movement is centered on ecology, health, as well as human rights.

The environmental movement is an international movement, represented by a range of environmental organizations, from enterprises to grassroots and varies from country to country. Due to its large membership, varying and strong beliefs, and occasionally speculative nature, the environmental movement is not always united in its goals. At its broadest, the movement includes private citizens, professionals, religious devotees, politicians, scientists, nonprofit organizations, and individual advocates like former Wisconsin Senator Gaylord Nelson and Rachel Carson in the 20th century.

Since the 1970s, public awareness, environmental sciences, ecology, and technology have advanced to include modern focus points like ozone depletion, climate change, acid rain, mutation breeding, genetically modified crops and genetically modified livestock.

The climate movement can be regarded as a sub-type of the environmental movement.