Miami, for example, has found that planting trees can help reduce air conditioning bills, for example, in summer months.

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As far as this summer's target is concerned he says, "planting 100 pansies in London is possibly unrealistic, but it's good to have a goal".

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The cool, wet spring in the Midwest delayed planting of the corn and soybean crops and that means pollination of these two crops is happening later in the summer.

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