Biden says he has 'practically' declared climate emergency but stops short of official declaration

Biden has taken significant actions on climate change, like rejoining Paris accord, but has not formally declared emergency.
Biden defended his climate record, touting signing largest climate bill and conserving more land.
Climate activists continue to urge Biden to officially declare national climate emergency.
Biden incorrectly claimed he already declared climate emergency, then backtracked to 'practically.'
While no formal declaration yet, Biden recognizes urgency of climate crisis as 'existential threat.'