Union of Concerned Scientists

JANUARY 7, 2025

The year 2023 was by far the warmest in Earths recorded history, and perhaps in the past 100,000 years , shattering the previous record set in 2016 by 0.27C (0.49F). In other words, 2023 and 2024 have been much hotter than scientists’ predictions. But why were 2023 and 2024 so warm?

2024 290

2024 2023 Fossil Fuels Atmosphere 290

Real Climate

AUGUST 9, 2021

As climate scientists we tend to look at the IPCC reports a little differently than the general public might. Here are a few things that mark this report out from previous versions that relate to issues we’ve discussed here before: Extreme events are increasingly connected to climate (duh!) 1, SPM, AR5.

Sea Level 361

Sea Level 2012 Radiation Ocean 361

Real Climate

AUGUST 12, 2021

I think in hindsight that my concerns from 2013 to some extent were supported by the fact that the IPCC organised an Expert Meeting on Communication, Oslo, Norway, 9–10 February 2016. In addition, ozone depletion higher up in the stratosphere has caused a cooling high up in the atmosphere.

Atmosphere 357

Atmosphere Greenhouse Ocean Sea Level 357

HumanNature

APRIL 10, 2023

Student in the Department of Atmospheric Science at Colorado State University Most people remember the water cycle they learned in school: water evaporates from lakes, rivers, and the ocean, air carrying this moisture rises, cools, condenses, and forms clouds, and these clouds precipitate water back down to the surface.

Climate Change 52

Climate Change Paris Agreement Atmosphere Cooling 52