You may have heard of Conservation International's #NatureIsSpeaking campaign — a series of wake-up call videos warning humans that "nature doesn't need people, people need nature" — but have you seen the amazing pictures Twitter users have been sharing?

The organization has called for users across the world to prove #NatureIsSpeaking by sharing their favorite photos. Here are some of Conservation International's picks:

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Some of our favorites:

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These compelling photos are inspiring and drive home the organization's message, and with every hashtag used, software and computer giant HP will donate $1 to the nonprofit. Be sure to log on to Twitter and share your best photos that explain how nature speaks to you!

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Anna Norris is an associate editor at Mother Nature Network. Follow her on Twitter and Google+.

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10 photos that show #NatureIsSpeaking
Conservation International has called for nature lovers and photographers everywhere to share their #NatureIsListening moments — and the results are beautiful.