Emma Thompson boards the pink climate change boat in London

British actress Emma Thompson talks to the media from atop the pink climate change boat Friday.

London (CNN)British actress Emma Thompson on Friday climbed aboard a pink boat that has occupied one of central London's main traffic intersections for the past five days as climate change activists protest in the UK capital.

Since Monday, the British-based Extinction Rebellion (XR) group has orchestrated non-violent mass protests, crippling some of city's major traffic routes -- including at Marble Arch, Parliament Square, Oxford Circus and Waterloo Bridge -- to highlight "disastrous inaction" on climate change.
The grassroots movement has three aims: to get governments to declare a "climate emergency;" to eliminate net greenhouse gas emissions by 2025; and to have citizens' assemblies lead the government on climate and ecological justice.
    Friday, Oscar-winner Thompson -- known for "Sense and Sensibility," "Saving Mr. Banks" and "Love Actually" -- joined protesters in the brilliant Good Friday sunshine at Oxford Circus. She told reporters she was inspired to join after watching the movement over the past week, Britain's Press Association reported.
      "This is the most pressing and urgent problem of our time, in the history of the human race," she said, adding that young people have been failed by her generation and politicians.
      "I have seen the evidence for myself and I really care about my children and grandchildren enough to want to be here today to stand with the next generation," Thompson added.
      Thompson joins the Extinction Rebellion protest at London's Oxford Circus on Friday.
      Thompson then climbed a ladder leaning on the parked vessel -- which has several activists lying beneath it -- and emerged on its deck as crowds cheered.
        "We are here in this little island of sanity and it makes me so happy to be able to join you all and to add my voice to the young people here who have inspired a whole new movement," she said.
        Thompson joins the fifth day of protests by an environmental campaign group that has blocked key junctions in central London to highlight the ongoing ecological crisis.