This Wednesday is Valentine’s day. Chances are high your thoughts are already floating off to your date night. Although it might seem as if there are few things further apart than love and climate change, I figured out they can affect each other in (sometimes scarily) significant ways.

You might not give a damn about rising seas and melting permafrost, but beware: hotter temperatures might affect action in the bedroom. What a bummer! In a study from the National Bureau of Economic Research in the US a couple years back, three researchers found indications that exceptionally hot days lead to a reduction in birth rates nine months later. To put it in the authors own words: “Extreme heat could raise the physiological cost of coitus on a given fertile day, leading to a shift in coital frequency to some subsequent day(s).” In layman’s words: when it’s too hot to bang, people usually catch up later. But postponing the sex doesn’t make up entirely for the decline, as the study of US birth rates between 1931 and 2010 suggests.