Clues from past on rising sea levels

The sea has swelled and shrank over Earth's long history shorelines have marched forward and back.

    Monday was Earth Day, a day designed to raise awareness of environmental challenges around the world, among them: rising sea levels.

    One major city threatened by higher tides is Los Angeles.

    That means combating climate change.

    And failure to do so may put major cities in jeopardy.

    Al Jazeera's Rob Reynolds reports.

    SOURCE: Al Jazeera


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