G7 propsal welcome but time is of the essence

Financial Times, 12 June 2015:

It is impossible not to welcome the proposal by the G7 to decarbonise the world’s economy, but the time-scale does not reflect the urgency of the situation (G7 in historic accord to phase out fossil fuel emissions this century, June 9). The carbon budget to keep temperature increases below 2 degrees C will be exhausted by 2040 at current emission rates. After that climate change will fuel its own progress through positive feed-back systems, notably methane releases from permafrost and the Arctic sea-bed, so the process becomes irreversible and mankind’s contribution largely irrelevant.

Dr Robin Russell-Jones
Stoke Poges, Buckinghamshire