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Climate & policy

The science of warming and the treaties that followed.

8 articles

Smokestacks of the Huntley Generating Station, a coal plant on the Niagara River in Tonawanda, New York

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How carbon pricing works around the world in 2026

See how carbon pricing works, from carbon taxes to cap-and-trade markets, plus current US and EU allowance prices and why the US has no federal one.
Main entrance of the EPA headquarters in the William Jefferson Clinton Building in Washington, DC

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What happened to the EPA’s Clean Power Plan

The Clean Power Plan set a 32% emissions target for 2030, but courts stalled it before EPA repealed it, and federal power plant carbon rules keep changing.
NOAA Mauna Loa Observatory in Hawaii, where atmospheric carbon dioxide has been measured since the 1950s

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How do we know humans are causing climate change?

Is climate change caused by humans? Yes. NOAA and IPCC data show how scientists know, from record heat to a fossil fuel fingerprint in the air.
Small ground-mounted solar arrays on a farm property

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How much money is going into clean energy now

Renewable energy investment is part of the $2.2 trillion that went into clean energy in 2025, almost twice fossil fuel spending. See where it went.
The Le Bourget conference center outside Paris during the COP21 climate summit in 2015

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What the UN climate summits have achieved since Copenhagen

COP30 closed in Belém without a binding fossil fuel deal. See what the UN climate summits have delivered since Copenhagen, and what comes next.
An oil refinery at Anacortes, Washington

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How much are fossil fuels subsidized, in the US and worldwide

Worldwide fossil fuel subsidies hit $620 billion in 2023 under the IEA, or $7 trillion under the IMF, plus what US oil and gas tax breaks cost.

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From Banks to Billionaires: Climate Protests Sweep U.S. Ahead of Global Talks

On Tuesday, the streets outside America’s financial giants looked less like corridors of commerce and more like staging grounds for climate resistance.…
The COP21 climate summit venue and pavilions at Le Bourget, near Paris

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Coming to Terms with the Paris Agreement: What It Means for Our Planet

The Paris Agreement represents a significant shift in how countries approach climate change globally. This landmark accord establishes a system where nations…