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change be provide usher be affect dull undergo be experience
explain be include add come go create be cause
The of the colour of the autumn leaves a spectacular, photogenic, natural event in many forests around the world. The myriad of golds, reds, yellows, greens and browns a colourful canvas that in the end of summer. This year in the USA, the autumn foliage has adversely by drought conditions. The vibrant colours of the leaves have been by unusually dry weather. Over 80 per cent of America's northwest is extreme conditions that not conducive to perfect foliage. The traditional autumnal beauty spots of Massachusetts, Maine, Rhode Island and New Hampshire are severe drought, and lacklustre colours.

Dr. William Keeton, a Forest Ecology and Forestry Professor at the University of Vermont, why the adverse conditions prevalent this year. He said: "It due to a combination of factors, good tree growth last year, mild drought and both warm days and cool nights over the last month." He : "The colours this year are about two weeks earlier than normal and will probably by fast and furiously. Largely, this is because the drought physiological stress for the trees." He warned: "The stress is not a good thing and may a harbinger of things to come with climate change. In terms of fall foliage, drought can the leaves to die and fall off earlier."

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