Suppose the impossible happens and the world leaders and tycoons get together and start working on reducing global warming. How immediately will we see the changes? What will happen when we get where we want to be?

https://www.quora.com/Suppose-the-impossible-happens-and-the-world-leaders-and-tycoons-get-together-and-start-working-on-reducing-global-warming-How-immediately-will-we-see-the-changes-What-will-happen-when-we-get-where-we-want-to-be/answer/TL-Winslow