SACRAMENTO .(AP) — Gov. Jerry Brown on Monday launched a website to document the effects of climate change and respond to those who question it, calling them climate change "denialists."

Brown's office announced the site while he was at Lake Tahoe with Nevada Gov. Brian Sandoval for an annual summit focused on the health of the lake, which straddles both states.

The Democratic governor said in a statement that climate change has irrevocably altered Lake Tahoe. He cited a 2005 study that found the lake warming at almost twice the rate of the world's oceans and a 2010 study that predicted earlier snowmelt with more runoff in the Tahoe basin and more severe droughts by the end of the century.

Researchers at the University of California, Davis have reported that climate change will irreversibly alter water circulation there, changing the conditions for plants and fish.

"It is just one example of how, after decades of pumping greenhouse gases into the atmosphere, humanity is getting dangerously close to the point of no return," Brown said in a statement. "Those who still deny global warming's existence should wake up and honestly face the facts."

Since he took office in 2011, Brown has pushed for increased investment in renewable energy and signed a law requiring that 33 percent of the state's energy come from renewable sources by 2020.

He also supports building a $24 billion twin-tunnel system to carry water from the Sacramento-San Joaquin River Delta to the Central Valley and Southern California.

The governor's Office of Planning and Research will manage the climate change website, http://bit.ly/Qvp35K .