The warmest time of the day is from 3-5 pm, not noon when the sun peaks. The warmest week of the year is between mid July and mid August, not the summer solstice in June. Similarly, the peak year of manmade global warming will come years after we stop increasing carbon pollution. The delay in feeling the full effects means, if we wait until the climate gets intolerable before acting, then we will have to endure many years beyond that intolerable level before our actions take effect. 

We know we are abruptly shifting our climate out of the comfortable zone that enabled human evolution, and we don’t know how bad it will get. We only know that we must act long before the climate becomes intolerable, in order to avoid catastrophe. 

Some say we should wait for more evidence about global warming before acting, such as scientific proof showing the damage caused by carbon pollution. This is like refusing to stop smoking and start taking medicine, until after the disease kills you. Climate scientists have already diagnosed the problem and prescribed the solution, but too many of us are unwilling to face the truth, change our behavior and take our medicine.