From Green Technology Daily an article arguing that global access to birth control is the most effect and essential “green technology”:
Are condoms and birth control pills more cost effective than windmills and solar panels as tools to curb global warming?
Yes, and by a wide margin, contends a recent study from the London School of Economics asserting that family planning is nearly five times more cost effective in mitigating global warming emissions than green energy technologies like wind and solar power.
Each $7 spent on basic family planning over the next four decades would reduce global CO2 emissions by more than a ton. To achieve the same result with low-carbon technologies would cost a minimum of $32. The UN estimates that 40 percent of all pregnancies worldwide are unintended.