Indeed it is, and probably one of the largest threats we'll ever face. There are, luckily, several things we can do to prevent it. For change to happen, we got to start with ourselves. It can be as simple as not taking as long and hot showers and start walking or traveling collectively instead of by car. Meat production is also a CO2 bomb, so adopting something like "Meat-free Monday" is a great thing to do. You can also start getting involved with green activism within international organizations such as Greenpeace and WWF or more local ones. I myself am a part of the Norwegian Greens (political party) and a Norwegian organization called Nature and Youth.