There's not a single electric engine in existence that can do the work of big, heavy, industrial machines needed for mining, building, and transporting the things needed for "alternative" forms of energy.
Until Tesla starts producing all-electric versions of these, we're locked into needing fossil fuels.
Cargo ships
Road construction and maintenance
Building high rises
Landscaping for more housing
hauling infrastructure components like massive sections of water and sewer pipes, Rail Supports, etc.
The work needed everyday to build and maintain our infrastructure can't just be replaced with "new technology" because we wish it so. Therefore, pretending we have total control over all factors in our lives that impact carbon emissions is naive or dishonest.
Even IF we could cut emissions in the US by 25%, that's ONE country. Now, if we assume MAN contributes 10-15% of the total carbon emissions affecting Climate Change, cutting just our emissions by 25% is not even a drop in the bucket global. The COST of that reduction could easily destroy our economy, as the energy sector would have to absorb the cost of retrofitting for new sources, and that cost would drive up the amount consumers pay for things like home heating and cooling, transporting goods and foods to the stores, and air transportation. Any energy-related product or service would create a ripple effect in all prices, driving inflation like it did in the 1970s.