I connected with Avatar's message about taking care of our planet. How can we create our own Pandora here on earth? -- Julie Patrick, Manhattan Beach, Calif.
Go for a walk in the forest. Go snorkeling in a coral reef. Appreciate the nature we have. I think that from a respect for nature comes action. The best thing people can do right now to help the planet is to understand how we've got to make a fairly rapid transition to alternative energy.

Is Avatar a Native American story? -- Robert Thijsen, Oranjestad, Aruba
Not exclusively. I think Americans locate the story there most quickly. But Avatar's now the No. 1 movie in Brazil, and Brazil has a lot of issues with the displacement of indigenous populations and deforestation. There's a tribe in India that is getting pushed off its sacred mountain for a bauxite mine. The film is hugely popular in China, and people there are getting displaced by the government to build dams. So people are relating to it from all these different perspectives.

Will there be an Avatar 2? If so, will it include the same characters? -- Jonathan Clarke, Taipei
If we make a sequel, we'll definitely continue the story of the main characters: Sam [Worthington] and Zoe [Saldana] and Sigourney [Weaver]. Well, I don't know about Sigourney. Sigourney's character is dead, but nobody's really ever dead in a science-fiction movie. I think it's more of a question of when than of if.