Best answer gets !

methane hydrates are kept in sediments deep in the ocean by the cold temperature and high pressure. some scientists are concerned that there could be a release of immense amounts of natural gas contained in methane hydrates. why are climate scientists concerned about this?

methane is a greenhouse gas, so its release would likely increase global warming.

methane is toxic to marine organisms and would damage the ecosystem if released by killing species.

this would lead to massive pollution of drinking water.

we want to extract and use this gas as a fuel source, but it would be lost to the environment through this process.

"Methane is a greenhouse gas, so its release would likely increase global warming."

Explanation:

Methane is a greenhouse gas, so its release would likely increase global warming.

This is the only one that is both "true," and that applies to climate scientists.

Methane is toxic to marine organisms and would damage the ecosystem if released by killing species.

We are asking about climate scientists.

This would lead to massive pollution of drinking water.

 We do not get drinking water from the ocean (except in some desert countries).

We want to extract and use this gas as a fuel source, but it would be lost to the environment through this process.

Again, climate scientists.