Here are some movies on environmental issues. They are not in any specific order, just sharing some of movies that brought me some thoughts about the planet that we are living in:)
1. The Cove, 2009
A documentary-movie about human-beings slaughtering dolphins in Japan.

In a sleepy lagoon off the coast of Japan lies a shocking secret that a few desperate men will stop at nothing to keep hidden from the world. In Taiji, Japan, former dolphin trainer Ric O'Barry has come to set things right after a long search for redemption. In the 1960s, it was O'Barry who captured and trained the 5 dolphins who played the title character in the international television sensation "Flipper." One fateful day, a heartbroken Barry came to realize that these deeply sensitive, highly intelligent and self-aware creatures must never be subjected to human captivity again. This mission has brought him to Taiji, a town that appears to be devoted to the wonders and mysteries of the sleek, playful dolphins and whales that swim off their coast. But in a remote, glistening cove, surrounded by barbed wire and "Keep Out" signs, lies a dark reality. It is here, under cover of night, that the fishermen of Taiji, driven by a multi-billion dollar dolphin entertainment industry and an underhanded market for mercury-tainted dolphin meat, engage in an unseen hunt. The nature of what they do is so chilling and the consequences are so dangerous to human health that they will go to great lengths to halt anyone from seeing it.
2. The Day after Tomorrow, 2004
I believe that most of you watched this movie before. I believe this movie is not exaggerating the effects of global warming. It is the start of a series of end-of-the-world movies like 2012.

As Paleoclimatologist named Jack Hall was in Antartica, he discovers that a huge ice sheet has been sheared off. But what he did not know is that this event would trigger a massive climate shift that would effect the world population. Meanwhile, his son, Sam was with friends in New York to attend an event. There they discover that it has been raining non-stop for the past 3 weeks, and after a series of weather related disasters that occurred over the world. Everybody soon realizes that the world is going to enter a new ice age, as the rest of the world population tries to evacuate to the warm climates of the south. Jack makes a daring attempt to rescue his son and his friends who are stuck in New York, who have to survive not only a massive wave, but freezing cold temperatures that could possibly kill them.
3. Princess Mononoke, 1997
One of my favourite anime by Hayao Miyazaki. It is about the constant and arduous conflict between human and nature.

While protecting his village from rampaging bore-god/demon, a confident young warrior, Ashitaka, is stricken by a deadly curse. To save his life, he must journey to the forests of the west. Once there, he's embroiled in a fierce campaign that humans were waging on the forest. The ambitious Lady Eboshi and her loyal clan use their guns against the gods of the forest and a brave young woman, Princess Mononoke, who was raised by a wolf-god. Ashitaka sees the good in both sides and tries to stem the flood of blood. This is met be animosity by both sides as they each see him as supporting the enemy.
4. NausicaƤ of the Valley of the Wind, 1984
Another anime by Hayao Miyazaki.

One thousand years after a war devastated much of the Earth, humanity clings to existence at the fringes of a vast, polluted forest inhabited by monstrous insects. Only NausicaƤ, the princess of the tiny realm of the Valley of the Wind, grasps the environmental significance of the forest. She sees beyond petty wars and national rivalries to the only viable future for the planet.
Movie Review:
http://rpgland.com/anime/nausicaa-of-the-valley-of-the-wind/
5. Wall-E, 2008
Cute, but worth thinking.

This computer-animated science-fiction tale is a futuristic look at an Earth so polluted by mass consumerism that humans had to leave it. Wall-E clearly has an environmental agenda, but it gets the message across without preaching.