There is fossil evidence of CO2 starvation at the end of the last ice age, when CO2 levels dropped to below 200 ppm. Even today's 400 ppm is far too low for optimum plant growth.
Sixteen college professors signed a letter urging students to respect everyone's rights to think and speak for themselves.
"The University has a solemn responsibility not only to promote a lively and fearless freedom of debate and deliberation, but also to protect that freedom when others attempt to restrict it." Read the statement Princeton and the University of Chicago adopted to abandon political correctness and promote and defend free thought and speech. Forward it to your alma mater.