Taking profit out of polluting

From acid rain to sulfur-dioxide trading, a Friendship Award winner uses economics to help industries in both China and the US to go green, Xing Yi reports.

Two things have made US environmental expert Daniel Dudek very happy in the past few weeks.

The first was when UN Secretary-General Ban Ki-moon announced on Oct 5 that the Paris Agreement on climate change is set to enter into force on Nov 4. The second: Member states of the UN civil aviation agency agreed on a new standard to control greenhouse gas emissions from international airline flights through a market-based plan.