As if they didn't do enough for us already, the rainforests of the globe also help to control world weather. Rainforests act like giant air conditioners, cooling the planet with shade and helping to create rainfall. Every time we take a breath of fresh air, we have the rainforests to thank again. Air is cleaned and purified by the trees because the act like a filter. If your air wasn't filtered in this way, not only would the atmosphere be harmed , but our rivers and seas would be more polluted, too. All in all, it’s impossible to imagine life on earth without the rainforests.