How to pronounce “lessens”(verb) in English

sends it back down to earth. It also emits some out to space. So, instead of the stuff escaping, some of it is absorbed and sent back down. That acts to warm us up. It's likea blanket, right? Why does the blanket keep you warm? Because it lessens--it slows down radiation or energy away from you. The problem is, if you add a lot more greenhouse gases,then you'll tend to increase this blanketing effect, causing you to warm up. In fact, it's worse than that because if you warm up the earth, then that causes more water to evaporate