Climate change is unusual compared with most environmental issues in the extent to which it has become accepted among orthodox policy institutions and public‐and private‐sector organizations. The authors explore the conditions that have led to the establishment of an epistemic community that brings together a broad array of actors, including the various NGOs, and the operational dimensions that define the participation of NGOs within the community. An epistemic community does not imply conformity of opinion or approach but allows for differentiation in terms of how its members construct the problem, and their objectives, core beliefs and favoured responses to climate change. Three broad styles of engagement through which NGOs contribute to this debate are identified: developing creative policy solutions, knowledge construction, and lobbying or campaigning. It should be noted that the authors refer primarily to development or environmental NGOs (ENGOs), though they do discuss business NGOs at a few points.

Despite three decades of political efforts and a wealth of research on the causes and catastrophic impacts of climate change, global carbon dioxide emissions have continued to rise and are 60% higher today than they were in 1990. Exploring this rise through nine thematic lenses—covering issues of climate governance, the fossil fuel industry, geopolitics, economics, mitigation modeling, energy systems, inequity, lifestyles, and social imaginaries—draws out multifaceted reasons for our collective failure to bend the global emissions curve. However, a common thread that emerges across the reviewed literature is the central role of power, manifest in many forms, from a dogmatic political-economic hegemony and influential vested interests to narrow techno-economic mindsets and ideologies of control. Synthesizing the various impediments to mitigation reveals how delivering on the commitments enshrined in the Paris Agreement now requires an urgent and unprecedented transformation away from today's carbon- and energy-intensive development paradigm. Expected final online publication date for the Annual Review of Environment and Resources, Volume 46 is October 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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