Yes, the Earth goes through a natural ebb and flow but what you must recognize is that never in the past 400,000 years had the concentration of CO2 reached above 300ppm. While the Earth did appear to be in a natural warming period after a cooling period between 125,000 and 25,000 years ago, the unprecedented rise in CO2 concentration in the atmosphere is a direct impact of human effects on the climate, so much so that we have shot way past the old historical CO2 level and reached 405.25ppm. That's over a 100 ppm increase in CO2 concentration in less than a century, an unprecedented increase beyond any historic data. 

And on your point about clean water, it's great Congress repealed Obama's coverage of streams so that coal can now leach back into them. Real good job by Congress on that one.