OU "Chimp guy" suggests that he's seen CO2-induced changes over the last 13 years in Uganda?

OU prof appeals to student generation on importance of combating climate change

Known as the "Chimp guy" by the people who know him around campus, Sherrow is a resident expert on the human species' closest living relative, the chimpanzee. Since the start of his trips to Uganda in 2000, he has researched and observed the developmental behavior of chimpanzees for as long 12 to 13 hours a day.

Over the past 13 years while researching in a classic tropical climate with a wet and dry season, he told the audience that he has seen the forest change in response to changing seasons.
...In 2006, he started to correspond with former U.S. Sen. and Vice President Al Gore's group, Climate Reality Project, and just this past year he was in San Francisco to undertake a three-day training on how to give a presentation similar to Gore's "An Inconvenient Truth." The group saw his connection with students as an asset to the team, and as a result recruited him to the cause.