Not only can we do both, but there is significant overlap.

To give two examples among many:

SpaceX's next major goal after making Starship capable of flying to Mars is to develop the infrastructure to refuel Starship on Mars. They plan to manufacture their fuel using the Sabatier process, which is also a form of carbon sequestration.

Research and development into Martian food production pushes the envelope in many agricultural research areas like vertical farming, high efficiency production with few inputs, et cetera.

Then let's do both, and not just space exploration.

Do you honestly think people are focusing more on exploration than other things? We already do both.

Globally, no. In certain spheres (some influential), yes. And while I realize that my comment is (intentionally) pushing it a bit, I do think that when you look at the urgency of space exploration and climate issues that, per unit of urgency, space exploration is getting far more attention than climate issues.