Many things do come down to cost. If you are wrong and climate change scientists are right, our grandchildren will be paying megabucks to build dikes around all the major coastal cities of the world. Remember it cost $14.5 Billion for flood control upgrades in New Orleans alone after Katrina. http://www.nola.com/hurricane/index.ssf/2013/08/upgrated_metro_new_orleans_lev.html
Now multiply that by 1000. These costs far exceed the costs of simply reducing our current production of CO2.