"It is highly likely that in the near future we may be facing catastrophic increases in climate anomalies...." means that for our children and their children the earth will be a very difficult place to live.
Houston, 2017 Hurricane Harvey
I mean coastal cities flooded, wildfires, extreme drought, storms becoming still more intense, food shortages, people migrating from where it is unbearably hot to a little less so or where there is food.
Exactly when is a little harder. Much of it is has already happened. More will happen soon. Just ask the people of Puerto Rico or Houston, Texas. The latest reports are thousands dead in Puerto Rico and virtually nothing left standing. Sometime this century could mean tomorrow or in 30 years, unless we do some things that are almost impossible, and due to our president, every second makes it more imposssible.
Jim Hanson who is now at MIT and was NASA'S climate expert before that has said, and I quote: "the shit has hit the fan."