. >>> topping obama's list of experts is dr john holdren director of the office of science and technologyknow's lindsay moran met with him just steps from the oval office. >> what we are facing is human-driven changes in the global climate that are producing more hot days, heatwaves, extreme downpours and wildfires and droughts. sea level is rising. the ocean is acidifying because it absorbs excess carbon dioxide that humans have added to the atmosphere, into the ocean >>> but on captiol hill, republican james inhofe, chairman of the powerful senate, environmental and public works committee, disputes the idea that humans are fueling climate change. >> the climate is changing and always has. >>> he led a 98-1 vote agreeing that climate change is not a hoax. >> the hoax is people are so arrogant that they think they have the power to change climate. that is the hoax, not the fact that climate is changing. "techknow" invited that senator and the other republican members from the environmental committee to appear. all declined or did not respond. >> first of all, it's interesting that senator