One reason people believe the climate is heating is due to air conditioning, which makes them much more sensitive to the heat.
Heat index here in Maryland the last couple of days is near 100 degrees – with the dew point well up in the 70′s. I don’t use air conditioning and absolutely love it. I wish it was like this all year round.
But when I left the air conditioned gym last night after a half hour of lifting, it felt really hot outside until I got moving on my bicycle.