The Eiffel Tower, the Empire State Building, the Sydney Opera House, the Brandenburg Gate, the Acropolis and many more iconic landmarks went dark at 8:30 p.m. local time, Saturday night, for Earth Hour, an annual call for local action on climate change.

Earth Hour is the brain child of the World Wildlife Fund.

"By going dark for Earth Hour, we can show steadfast commitment to protecting our families, our communities and our planet from the dangerous effects of a warming world," said Lou Leonard, WWF senior vice president, climate and energy. "The rising demand for energy, food and water means this problem is only going to worsen, unless we act now."

Individuals and companies around the world participated in the hour-long demonstration to show their support for the fight against climate change and the conservation of the natural world.

WWF said Earth's "rich biodiversity, the vast web of life that connects the health of oceans, rivers and forests to the prosperity of communities and nations, is threatened."

The fund also reports that wildlife populations monitored by WWF "have experienced an average decline of 60 percent in less than a single person's lifetime, and many unique and precious species are at risk of vanishing forever."

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"We have to ask ourselves what we're willing to do after the lights come back on," Leonard said. "If we embrace bold solutions, we still have time to stabilize the climate and safeguard our communities and the diverse wildlife, ecosystems and natural resources that sustain us all."

"We are the first generation to know we are destroying the world," WWF said. "And we could be the last that can do anything about it." (VOA)