To comprehend something is to understand it completely. If you can't comprehend a text, it means that you don't understand the language very well.
A monoculture is a type of agricultural system in which a single type of crop is grown. This can be a problem because it can be hard to find new sources of food if the crop fails.
Reforested means that the trees that were taken down to make room for the new growth are now back in place. The trees are replaced with new growth, and the forest is back to its original size.
A monoculture is a type of farming system in which a single crop is grown in large quantities. This can be a problem because it's difficult to find a variety of crops to eat, and it's difficult to produce food in large quantities.
To squander something is to use it up or to use it in a way that is not very effective. When you squander your money, you are not able to save it or use it in a beneficial way.
When you learn something, you are able to understand it better. This can happen through experience or through learning from other people.
Peatlands are areas that are covered in wetland soil that is high in peat. Peatlands are a important part of the global carbon cycle, because they help to store large amounts of carbon.
To underpin something is to support it with something else. If you underpin a building with concrete, you make sure that the building is stable and will not collapse.
A pandemic is a widespread epidemic. A pandemic can be caused by anything from a virus to a new kind of bacteria.