claim: Barack Obama told the U.S. Coast Guard Academy "that the number one threat to the military and the world today is global warming."
evidence: CO2 + H2O ⇌ H2CO3 ⇌ H+ + HCO− 3 It is the decrease in pH that signals the brain to breathe faster and deeper, expelling the excess CO2 and resupplying the cells with O2.