The Most Effective and Practical Way of Reducing CO₂ emissions

Multiple Choice

The most effective and practical way of reducing CO₂ emissions is to ___________.

A) make many small changes over all of the human population that act like 'wedges' reducing emissions
B) switch to all renewable energy as soon as possible
C) stop all industry that emits CO2 regardless of the economic problems it may cause
D) There is no problem with climate change, so we do not need to do anything.