Today: all about clouds. Clouds are some of the most important, yet least understood, parts of the feedback mechanism involved in climate change. Do they increase global warming or not? All over the world or not. The short answer is: it depends. The longer answer(s) will follow soon as this is one the most intense and exciting areas of climate research today.
The mandatory primers on clouds and aerosols:
A good intro to cloud feedbacks in climate change:
Why cloud feedbacks are likely to be positive, or amplify global warming, in the tropics:
But there is a lot of uncertainty left, and this is where the climate skeptics are pointing their big guns:
Including solving (or at least slowing) global warming by increasing the pollution levels: