Moments In Light is a collection of images (mainly landscape and travel photos) made available (some rights reserved, but free for personal use) to encourage others to donate to a list of suggested charities.
In no particular order:
http://www.wilderness.org.au The Wilderness Society is a community-based environmental advocacy organisation whose mission is protecting, promoting and restoring wilderness and natural processes across Australia for the survival and ongoing evolution of life on Earth.
http://www.rainforestrescue.org.au Rainforest Rescue is a not for profit organisation committed to saving our rainforests for current and future generations. Rainforest Rescue creates opportunities for individuals, families, philanthropists and philanthropic trusts, businesses and corporations to finance successful projects that protect and restore our dwindling rainforests.
Note that we are not associated with any of these.
Alternatively, try a website like http://www.charitynavigator.org to get further inspiration. From their (US-centric) website: "Founded in 2001, Charity Navigator has become the nation's largest and most-utilized evaluator of charities. In our quest to help donors, our team of professional analysts has examined tens of thousands of non-profit financial documents. As a result, we know as much about the true fiscal operations of charities as anyone. We've used this knowledge to develop an unbiased, objective, numbers-based rating system to assess the financial health of over 5,000 of America's best-known charities."
Some examples of international environmental charities (rated 4-star by Charity Navigator) are:
http://www.nature.org "The leading conservation organization working around the world to protect ecologically important lands and waters for nature and people."
http://www.rainforest-alliance.org "The Rainforest Alliance works to conserve biodiversity and ensure sustainable livelihoods by transforming land-use practices, business practices and consumer behavior."
http://www.conservation.org "We believe that the Earth's natural heritage must be maintained if future generations are to thrive spiritually, culturally, and economically. Our mission is to conserve the Earth's living heritage – our global biodiversity – and to demonstrate that human societies are able to live harmoniously with nature."