Real Climate

NOVEMBER 29, 2023

It is 33 years now since the IPCC in its first report in 1990 concluded that it is “certain” that greenhouse gas emissions from human activities “will enhance the greenhouse effect, resulting on average in an additional warming of the Earth’s surface.” Carbon dioxide data from air bubbles enclosed in Antarctic ice.

Greenhouse 301

Greenhouse Radiation Cooling Carbon Dioxide 301

Real Climate

OCTOBER 12, 2021

In this, he is in violent agreement with Isaac Held, his colleague at GFDL, and indeed most climate scientists. These were very much the ideas that set the discussions in climate science in the 1990s. As you will recall, Hansen had declared in 1988 that “the greenhouse effect is here!”, Hegerl et al.,

Atmosphere 317

Atmosphere Ocean Greenhouse Climate Change 317

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!) 1981) which can be seen here.

Sea Level 341

Sea Level 2012 Radiation Ocean 341