Bill Clintonese.
"Simply waiting for low-carbon-emitting renewable capacity to be large enough will mean that it will be too late to meet the mitigation goals for reducing [carbon dioxide] that will be required under most credible climate-change models," she warned.
You wanted a quote, but then ignored it in favor of a fabrication of your own design.
There's no direct quote about natural gas mitigating GW effects. Who's doing the Clintonese parsing? You. Nice try.