There are two ways to interpret this question: Will humans exist in 3029 or will humans exist on Earth in 3029?

The first question deals with whether humanity will be extinct by 3029. In the lifespan of species, 1000 more years is generally fairly insignificant. Many species have survived for millions of years. However, human civilization has the unique ability to dramatically change its environment.

Generally, possible human extinction events include nuclear war, climate change, asteroid strike, and artificial intelligence takeover. It’s difficult to know how likely any of these events are. As far as consuming lots of plants and other materials, this generally shouldn’t a problem if we use renewable resources. Plants are renewable since they get energy from the sun so as long as we carefully control our consumption, this shouldn’t be a problem. Materials like oil and coal are not renewable so someday we could run out of them. However, we don’t necessarily need these materials to survive.

The other way to interpret this question is whether humanity will have become a space-faring species so that we’ll live on other planets (or moons). In this case, if Earth sustained too much damage,humans could move to other planets. Although, one would think that even if humanity spread to other planets, there would always be some group of people that stay on Earth.