These are useful websites for you to use.
https://climatekids.nasa.gov/fossil-fuels-coal/
https://www.bbc.co.uk/bitesize/topics/zshp34j/articles/zntxgwx
https://kidsforsavingearth.org/programs/climatechange/b/
http://projectbritain.com/resources.html
There are lots of other places to look at and lots of informative videos for you to watch!