4-5 предложений про потепление! Почему оно происходит? как? ну и ещё что-нибудь!

The global warming is a serious problem of all modern humanity. It happens because people cut down forests and build many factories. Also people pollute the environment. All this makes many gases which gather in our atmosphere. Because of that gathering the heat doesn't go out of our planet. And it makes hotter and hotter.