Global warming is the process of the world heating up because of things like fossil fuels that produce carbon dioxide that traps heat in the atmosphere.
Because of global warming the ice caps are melting making the ocean levels rise and scientists predict that in a few years there will be major flooding because the sea level has risen so much plus animals like polar bears have been drowning because they can't find any stable land to live on and because of this they could go extinct.
But there is still hope! There is quite a few ways we can help out without totally changing our lifestyles. You could buy more organic foods, shop locally, unplug your chargers when you leave, don't buy plastic bottles, try to drive with more people instead of separately, walk and bike more, and other little things along those lines.