Here’s a quick practice exercise on the subject of global warming – a very HOT (ha, ha) topic in IELTS. There’re some on-line questions that go with the text.
You should be aiming to do an exercise like this in a maximum of 10 minutes (it’s much shorter and easier than real IELTS exam reading texts, unfortunately). Good luck!
Here’s the link:
http://www.ecenglish.com/learnenglish/lessons/ielts-practice-global-temperatures