There are lots of alternatives being worked. They just aren't being proposed by those with a socialist agenda or a method to raise taxes (Carbon Credits). The US output of CO2 has gone down dramatically over the last 6 or 7 years and will continue to go down.
The real answer is technology that takes in CO2 emissions and breaks it down into other compounds and chemicals such as Carbon and Oxigen. Put a fraction of the trillions into that research and see benefits acroos the entire planet as all will be onboard!