Yosemite Fire Grows As Crews Protect Iconic Sequoias

The video discusses the current fire threat to Yosemite National Park, focusing on the efforts to protect the iconic giant sequoias, particularly the Grizzly Giant. Firefighters are using flame retardants and sprinkler systems to safeguard these trees. Mariposa Grove, home to about 500 mature giant sequoias, is highlighted as a critical area under threat.

What is the main threat to Yosemite's giant sequoias as mentioned in the text?

How many mature giant sequoias are contained in Mariposa Grove?