The opposite of "bottom" in "the reservoir's bottom" (l.27) is:

rot in "the plants rot" (l.26) has the same meaning of:

The opposite of "clean" in "is very clean" (l.9) is:

The expression "take into account" in " take greenhouse gas emissions from hydropower reservoirs into account" (ll.3-4) means:

damage in "can seriously damage" (ll.1-2) signifies:

The article presents a topic which is:

The study mentioned in the text focuses the:

In this text, the author:

since in " Since biodiesel can be used" (l.14) indicates:

In what regards global warming, carbon dioxide can: