A committed environmentalist, DiCaprio has received praise from environmental groups for opting to fly on commercial flights instead of chartering private jets, which use more fuel. However, this past New Year's Eve, De Caprio used a private jet to attend parties in both Australia and Las Vegas. There was no comment from the actor on his hypocrisy. He has also mentioned that he drives a hybrid car and that his house has solar panels.[8] His actions have inspired other celebrities, such as Orlando Bloom and Penelope Cruz. In an article in Ukula about his new film 11th Hour (which he co-wrote, co-produced and narrated), DiCaprio cites global warming as "the number one environmental challenge."[9] DiCaprio and former vice-president Al Gore announced at the 2007 Oscar ceremony that the Oscars