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  (Reuters/Jason Reed)
  American actress Daryl Hannah is arrested as she joins a protest against the Keystone XL oil pipeline, outside the White House in Washington, August 30, 2011. Dozens were arrested in the protest against the pipeline that, if completed, will stretch from Canada to the gulf coast of the United States.

Daryl Hannah has been arrested again over her deep convictions about the Keystone oil pipeline on Wednesday, with the claim that protecting the environment is a "moral obligation."

The actress along with scientist James Hansen, Robert Kennedy Jr., and several other high-profile personalities were arrested on Wednesday after handcuffing themselves to the gates of the White House and demanding that Barack Obama shut down the Keystone XL pipeline project. In total, about 50 people were detained over the protest.

This was not Hannah's first brush with the law over the issue. The actress and a 78-year-old Texas landowner were taken into custody last year for trespassing after taking a stand against the pipeline that will bring crude oil from Canada to the Gulf Coast.

Continuing her efforts as an active environmentalist, Hannah appeared on Fox News speaking to host Sean Hannity this week.

"It is our moral obligation as citizens of this country and of the world to take action," declared the actress.

"You have children, right? You want them to live in a world where there's water and food and a livable climate [and] that they won't be struggling to survive, right," Hannah asked Hannity.

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The "Splash" star agrees with critics who say the pipeline will hurt the environment, while its supporters claim the pipeline will lead to job creation and less foreign dependence on oil.

"This isn't drilling for oil; this is extreme lethal extraction," Hannah noted while on Fox.

Many people including the "Kill Bill" actress feel that the pipeline would be unsafe because it would be carrying mass amounts of heavy, acidic crude oil that could more easily corrode a metal pipe, which could lead to a spill.

TransCanada, who owns the $7 billion pipeline that Hannah and others have long opposed, maintains that its pipeline would be the safest ever built and bring the same oil that arrives from Venezuela or parts of California.

As for President Obama, Hannah said: "I don't like politics; I don't trust politicians. That's where I stand."