The best time to act is now!
#1 Not sure if Climate Change is real? Please ask yourself why?! It's ok to have questions. What would convince you?! There is no single article or fact, but please try 6 Claims Made by Climate Change Skeptics—and How to Respond
#2 Commit to personal action.
#3 Work our your carbon footprint here, so you know what your starting point is.
Many more tips to follow!
See also the Climate Change tips on this website's Blog