Scientists are discovering new solutions to pollution for many years., Scientists have been discovering new solutions to pollution for many years., By the time we arrived at the beach, the tide was polluted the entire shore., By the time we arrived at the beach, the tide had polluted the entire shore., If governments will invest more in green technology, emissions could decrease., If governments invest more in green technology, emissions could decrease., They had been plant trees in the area before the wildfire started., They had been planting trees in the area before the wildfire started., This time tomorrow, we clean up the local park., This time tomorrow, we will be cleaning up the local park..

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