Reuters: Lights went out at tourism landmarks and homes across the globe on Saturday for Earth Hour 2009, a global event designed to highlight the threat from climate change. From the Sydney Opera House and Harbour Bridge to the Eiffel Tower in Paris and London’s Houses of Parliament, lights were dimmed as part of a campaign to encourage people to cut energy use and curb greenhouse gas emissions from fossil fuels. Organizers said the action showed millions of people wanted governments …