Here is an understandable video summarizing data about climate change. The short video istraightforward and not hysterical. Give it a view.
As the introduction points out: the heat from human emissions is roughly equal to exploding 400,000 Hiroshima atomic bombs every day. Historically, every time carbon dioxide levels increase in Earth's atmosphere, the average surface temperature increases, ice melts, and the seas rise.
Give yourself 5 minutes and check it out.