They point to natural and temporary causes but the effect highlights at least two challenges that will complicate combating climate change: 1) Comprehensive mon

They point to natural and temporary causes but the effect highlights at least two challenges that will complicate combating climate change: 1) Comprehensive monitoring of local releases into the atmosphere will be required to prevent ugly surprises and 2) Human impact interacts with natural phenomena in difficult to predict ways (the famous tipping points are effectively non-reversible examples of this)