http://thinkprogress.org/climate/2015/08/31/3696952/climate-action-costs-less-than-inaction-citibank-says/
"A new report from Citibank found that acting on climate change by investing in low-carbon energy would save the world $1.8 trillion through 2040, as compared to a business-as-usual scenario. In addition, not acting will cost an additional $44 trillion by 2060 from the “negative effects” of climate change."
