Which trend should we reverse? The poverty trend in underdeveloped countries? I’ll go for that. Reverse the trend in increasing malaria rates? Yes, by all means. But my guess is you refer to the CO2 increase and related temperature. You must determine first which is the cause and which is the consequence. Increasing evidence stemming from scientific research (peer reviewed as you like) indicates that temperature rise came first and CO2 levels increase came later –much later. Then you should determine with scientific and undeniable certainty that the observed trend is dangerous and harmful –something that “Increasing evidence stemming from scientific research (peer reviewed as you like) indicates” that the opposite is true: warmer is better, and that was seen during the Medieval Warm Period, sometimes referred by climatologists as the Little Climatic Optimum. So what? That’s happens over just 5% of Earth’s surface covered by cities. If you don’t like it, or think it is deleterious to your health simply move to the country and becomes a farmer. Return to Mother Nature and be happy! Give up electricity, cars, the internet, airplanes, nuclear medicine, safe and abundant food, and some other devilish things that progress has given us. So you still believe that acid rains are caused by man’s activities? Follow Frank Sinatra's advice: "Wake up to reality!". Rains are naturally acid, and in “pristine” regions away from urbanized centers and industries the pH of rains are in the range of 5.7 pH. There are some regions in the world that are exceptions (as regions in China) where calcium carbonate dust in the air makes the rains slightly alkaline with a pH of 7.5 to 8. Why natural rains are acid? The rain washes down CO2 and forms carbonic acid. It also washes down formic acid from the jungles (produced by trillions of ants) so you will never find neutral rain (except in China and some other dusty deserts). It also washes down chlorine from oceans, making hydrochloric acid. Wake up! Read science, stop reading press releases and NGOs leaflets and brochures!