UPDATE:
7/19/22
“AP source: Biden holds off on climate emergency declaration”
https://www.msn.com/en-us/news/politics/ap-source-biden-holds-off-on-climate-emergency-declaration/ar-AAZKDwz?ocid=msedgntp&cvid=f62609e5d4b94377a7cb92bfe6d02b52
Mostly because it has little power or effect.