100% Renewables by 2050 will Save Money, page-17

I think the debate is the degree of government intervention (from say Texas 'get out of my way' to Sweden 'care from cradle to grave' - pure capitalism to socialism) trying to solve a perceived problem with money that slows the economy of the country.
This is the same for welfare, cycling paths etc. - it is just scale of the damage to the economy called for by some groups and governments is substantial and in the case of Australia could severely damage the economy threatening cuts to other areas like social services.
How much research funding, subsidies and penalties are appropriate to guide the economy greener, is and will be a source of heated debate (current opinions range from zero to everything we can).