What unsolved mysteries exist within environmental science?

Environmental science has some mysterious questions that scientists still don't have answers to, like when you're trying to solve a puzzle but there are pieces missing.

Imagine you have a big, beautiful garden, your favorite place to play. Now picture it suddenly getting really hot and dry, like when the sun is so strong it feels like it's burning your skin. Scientists wonder: why does this happen sometimes? That’s one unsolved mystery, how the Earth’s climate changes in ways we don’t always predict.

Another mystery is about tiny living things, like little bugs or even bacteria, that help plants and soil grow healthy. But sometimes these helpers disappear or change, just like when your favorite snack runs out and you don't know where it went! Scientists are trying to figure out why this happens, and how it affects everything else in nature.

There’s also a big question about plastic, the stuff we use every day for bags and bottles. It ends up in oceans and lakes, and no one knows exactly what happens to it after that. Does it just sit there forever? Or does it go somewhere weird?

These mysteries are like hidden treasures waiting to be discovered!