There is an extensive, well researched thread on the Anti-Global Warming Debate on a paranormal chat forum called The Paracast Forum, including numerous links to primary source materials. While I have not gone through it all, the evidence is in fact mixed, with any remedial effort costing society an enormous amount with unclear results. One of the issues is the computer programming used to decipher the trends supposedly indicated by the source evidence, as well as development around, and movements in, the temperature mesaurement stations. Of course, any remedial efffort is likely to hurt the poor of the world as much, if not more than, the rich.
None of this obviously argues in favor of pollution. Stop using plastics, particularly as drinking water delivery vehicles, and take public transport & walk. Also, think about becoming a vegan, and take steps to reduce the deforestation of the rainforest.
On the decimation of the American middle class, the movement of manufacturing to low cost centers around the globe certainly hasn't helped, and is probably the main contributor to the dramatic loss in jobs that traditionally supported many middle class families. The high tax rates used to support various government programs (no value judgement here one way or another) isn't helpful. In Hong Kong, where I live, the income tax is 16%, although property prices are very high given the lack of available supply (which could be remedied if the legislature had the political will).