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Expand chart
Reproduced from IPCC Sixth Assessment Report; Chart: Axios Visuals

In addition to the myriad physical science indicators, such as glaciers around the world melting synchronously, one of the ways we know that modern climate change is human-caused is by looking at temperature observations and comparing them with what would be expected if only natural variability were at work.

Why it matters: This approach to analyzing climate change causation has been tested and retested by scientists over the past decades, each time resulting in the same answer.

How it works: Scientists from the Intergovernmental Panel on Climate Change plotted global average temperatures going back to 1850 and compared these trends with computer models simulating what would be expected from natural variability alone.

  • Only the models that incorporate both human influences — mainly the increase in greenhouse gas emissions — and natural factors, such as volcanic eruptions and changes in solar output, match the observed record.

Go deeper: IPCC's journey from "probable" to "unequivocal" on human-caused warming

Go deeper

Oct 26, 2021 - Politics & Policy

Scoop: Biden plan expected to include at least $500B for climate

Photo: Stephanie Keith/Bloomberg via Getty Images

The White House is privately telling lawmakers the climate portion of President Biden's roughly $2 trillion social spending plan is "mostly settled" and will likely cost more than $500 billion, two sources familiar with the talks tell Axios.

Why it matters: A price tag of $500 billion to $555 billion is a huge number and, if it holds, would likely be the single biggest component of the sweeping package. It also isn't far off from the roughly $600 billion proposed when the bill was expected to cost $3.5 trillion.

3 hours ago - Technology

Facebook changes corporate name to Meta

Screen shot of CEO Mark Zuckerberg at the company's "Connect" virtual event

CEO Mark Zuckerberg on Thursday said the social media giant is renaming its company Meta.

Why it matters: The effort is meant to shift its image from a social media platform to a “metaverse” company that focuses on building virtual work and social communities.

Dan Primack, author of Pro Rata
4 hours ago - Economy & Business

Filings show Sweetgreen isn't profitable, despite claims

Illustration: Sarah Grillo/Axios

Restaurant chain Sweetgreen on Monday filed to go public, and revealed that it lost money in each year since 2014.

Why it matters: The company lied when it repeatedly told reporters it was profitable.

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