Here are some quotes from Happer: 

“This is George Orwell. This is the ‘Germans are the master race. The Jews are the scum of the earth.’ It’s that kind of propaganda,”

That sort of rhetorical excess has no place in a scientific discussion. The vast majority of climatologists are hard-working scientists. Even if they are wrong, they aren’t Hitler. 

“Carbon dioxide is not a pollutant. Every time you exhale, you exhale air that has 4 percent carbon dioxide. To say that that’s a pollutant just boggles my mind. What used to be science has turned into a cult.” 

That completely and utterly shows how confused Happer is. Breathing is (generally) carbon-neutral. The carbon you exhale as CO2 came from plants that fixed the carbon from the atmosphere. 

All this, then there was a jump to conclusion that correlation of a 0.8 degree C rise in temperature happened during the last 150 yrs.  Of course, the “scientists” seem to disregard solar activity changes, along with several other temperature drivers instead associating it all to a tiny trace gas in the atmosphere.

” At the present time, the concentration is about 390 ppm, 0.039 percent of all atmospheric molecules and less than 1 percent of that in our breath. About fifty million years ago, a brief moment in the long history of life on earth, geological evidence indicates, CO2 levels were several thousand ppm, much higher than now. And life flourished abundantly.”

Though related, they refer to different things. Global warming refers to the increase in the Earth’s average temperature. Climate change refers to changes in the overall patterns of weather. 

This is the first peer-reviewed study to investigate what level of carbon dioxide emission would be needed to prevent further warming of our planet.

“Most scientific and policy discussions about avoiding climate change have centered on what emissions would be needed to stabilize greenhouse gases in the atmosphere,” says Caldeira. “But stabilizing greenhouse gases does not equate to a stable climate. We studied what emissions would be needed to stabilize climate in the foreseeable future.”
 
The scientists investigated how much climate changes as a result of each individual emission of carbon dioxide, and found that each increment of emission leads to another increment of warming. So, if we want to avoid additional warming, we need to avoid additional emissions.
 
With emissions set to zero in the simulations, the level of carbon dioxide in the atmosphere slowly fell as carbon “sinks” such as the oceans and land vegetation absorbed the gas. Surprisingly, however, the model predicted that global temperatures would remain high for at least 500 years after carbon dioxide emissions ceased.

Could it possibly be because your latter three examples actually work?

Respiration is (generally) carbon-neutral.