Why Was There Less Pressure on the Industry to Reduce

Why was there less pressure on the industry to reduce emissions from 2010- 2012?

A) The recession led to less output and hence lower emissions
B) Owing to the global downturn, there was a worldwide agreement to delay the deadlines of the emissions targets
C) In order to help developing countries progress, emissions targets were reduced
D) Usage of the environment had fallen to a sustainable level