What different ideas did scientists in the twentieth century have about the effect of adding carbon dioxide to the atmosphere?

In the 19th century, scientists realized that gases in the atmosphere cause a "greenhouse effect" which affects the planet's temperature. These scientists were interested chiefly in the possibility that a lower level of carbon dioxide gas might explain the ice ages of the distant past.

Explanation:

- self-esteem and a clear goal for writing

- financial security

- a room to be alone