protective ozone shield造句

• With unusual ease, nations are phasing out chemicals that destroy the Earth's protective ozone shield.
• Then came an announcement from the World Meteorological Organization that a worrisome hole in the earth's protective ozone shield appears to be getting even larger over Antarctica.
• The United States'production of other industrial chemicals that erode the earth's protective ozone shield, the largest output in the world, is being phased out, and the shield is expected to recover in time.
• Representatives of more than 100 governments agreed last week to phase out developed countries'production of methyl bromide, an agricultural pesticide that had been the only industrial chemical responsible for weakening the earth's protective ozone shield not previously designated for elimination.
• Last week, for the first time ever, the Royal Swedish Academy of Sciences awarded a Nobel Prize to scientists for work on an environmental problem _ in this case, the role of industrial chemicals in weakening the earth's protective ozone shield.