Depends on how far you go back. Grasslands came after jungles/forests.
Based on some of our traits (nose shape good for diving, can control our breathing voluntarily, fingers get more grippy when wet, lack of fur), we might have even been semi-aquatic for a while.
Yeah, that's why I said might, since any evidence is circumstantial and could have another explanation. I did not intend to present that as fact but merely a possibility of even more extreme environment changes than jungle to grasslands that we might have had in our ancient past.