WATCH: John Kerry pushes for more green energy while experts warn about energy shortages

President Joe Biden's Climate Czar John Kerry said officials must "accelerate the transition" towards green energy.

"The challenge for all of us now is that no one country can solve this problem by itself," Kerry said.  "We all have to be able to reduce the emissions, we have to accelerate the transition,"

"We're behind," he continued. "We're not yet fulfilling the promises that we made in Glasgow, so we have our work cut out for us."

His comments follow warnings from industry experts who say plans to replace fossil-fuel and nuclear plants with "renewable" sources will result in mass shortages.

"As we move forward, we need to know that when you put a solar panel or a wind turbine up, it’s not the same as a thermal resource," John Bear, the CEO of MISO told the press in May.

"Green" energy sources such as solar and wind rely heavily on batteries. Battery efficiency is constantly improving, but it's not enough to keep up with current demand if plant closures continue as planned, Bear said.

Critics have also said wind turbines are not as environmentally friendly as some climate change activists claim, citing the blades mostly heading to landfills.

And, solar panels require 300+ times as much land as conventional energy sources, said Michael Schellenberger, bestselling author of "Apocalypse Never" and "Hero of the Environment."

"Now the Los Angeles Times has discovered that they could 'contaminate groundwater with toxic heavy metals such as lead, selenium and cadmium,'" he wrote on Twitter.

Kerry previously said that America needs to deploy electric vehicles "22 times faster" and close coal plants "five times faster."

"Well, the International Energy Agency tells us that, in order to meet the goals by 2030 of the 45 to 50 percent reduction [in emissions], we have to be deploying renewables five times faster."

"Five times faster. We have to be shutting coal plants five times faster. We have to be deploying electric vehicles 22 times faster. We are behind," Kerry urged.