Sources:

Government Action - 
(1) Emission Database for Global Atmospheric Research (EDGAR) release version 5.0, FAO, Goldman Sachs Global Investment Research

Carbon Pricing -
(1) Goldman Sachs Global Investment Research

Technological Innovation -
(1) Goldman Sachs Global Investment Research
(2) Goldman Sachs Global Investment Research
(3) Goldman Sachs Global Investment Research

Capital Markets Pressure -
(1) Morningstar, Goldman Sachs Global Investment Research
(2) Goldman Sachs Global Investment Research