Localized pollution and climate change are different issues. Both are bad, but you can’t equate “lakes of sludge outside factory cities in China” and the dramatic changes expected if the models are correct. Whataboutism isn’t helpful here (or anywhere, really). Climate change IS an issue, and it’s only going to get worse. Ten-year cell phones won’t make a lick of difference if we continue burning fossil fuels, and lakes of sludge will seem like Club Med in comparison to rising global temperatures.