The sperms are rapidly declining and researchers believe environmental factors are at stake. Veuer Tony Spitz has the details.

The latest problem associated with global warming: male sperm.

It's not good news. According to a New study published Tuesday seems fertility in men decreases when temperatures fall. The study showed "clear evidence" that stress from heat waves reduces "sperm and vitality" in bugs.

Yes, the researchers used beers to test their theory. But researchers say that the insects can be used as a proxy for humans.

Beetles are one of the most common species on earth, "so these results are very important to understanding how the species reacts to climate change," says co-author Matt Gage, an ecologist at the University of East Anglia in U.K.

Heat waves are expected to be more frequent and more extreme this century as human-induced climate change continues.

"Research has also shown that heat shock can damage male reproduction in warm blooded animals, and previous work has shown that this leads to infertility in mammals," added lead author Kirs Sales, also at the University of East Anglia.

"Our research shows that heat waves halve male reproductive exercise, and it was astonishing how consistent the effect was," he added.

In men, the testicles are sperm and in order to do this, the testicles must be cooler than the inside of the body, according to the University of Rochester Medical Center.

In the survey published Tuesday, researchers found that "heat wave conditions (9-13 degrees above the typical high temperature for 5 days) injured male but not female reproduction. Heat waves reduce male fertility and sperm competitiveness and successive heat waves almost sterilize men," said the study.

In addition, the offspring of the dads who had endure the heat lived a shorter life span.

"In terms of heat waves and reproduction, men can not stand it," concluded sales.

The study was published in Nature Communications, a peer-reviewed British journal.

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