A virus that infects only carp may provide a way to reduce the carp that infest a major Australian river.

It probably won't eradicate them, though; probably some are resistant.

By releasing several such species-specific viruses at once, and spread them carefully, we might be able to eradicate the species from a region.

Obama proposes to make oil and coal extractors pay for their environmental costs.

This would drive the price way up and encourage conservation. However, it needs to apply to imported coal and oil, not solely to the coal and oil extracted in the US.

The IMF endorsed a carbon tax on ships and planes.

It should cover everything, but that would be a good start.

Around the world, religious fanatics' attacks on abortion rights have caused a substantial decrease in safe, legal abortions, matched by an equal increase in unsafe illegal abortions.

200 prisoners died in Russia in 2015. Were some of them killed by thugs?

In India, the ancient superstition that considers menstruating women "impure" still oppresses women today.