Some cars get hotter than 150 degrees inside when parked in the sun, so reducing the temperature could mean Toyota could use a smaller AC unit, he added.
But Nasa's GISTEMP unit - the division of the agency that maintains the temperature dataset - suggests further warming is coming, with the temperature record for an individual year likely to be set within the next year or two.
In addition, more babies born to obese women required admission to the neonatal unit and were more likely to require assistance with feeding and maintaining body temperature.