- in the U.S. one in 8 people lives in poverty, and that's not counting the illegal immigrant families (1 in 20 workers in the US is illegal). The poor pay very little if any income taxes, so how will a reduction in income tax help them cope with the increase in price of core products? Won't it make their situation perhaps more dire?

- in a globalized world where the cost of commodities is dictated by the market, one country's taxes hurt its exports just the same as another country's subsidies help that country's exports. On what basis should one country decide to take on the task of curbing emissions at the expense of its exports?

Re the last point, I don't mean to come across as defeatist. If countries behaved as its people in doing the right thing, the world would be a better place.