Climate change encourages certain types of weeds, which will become a much bigger problem for gardeners and orchard farmers. Noxious weeds, including poison ivy and ragweed – the pollen of which is a leading cause of allergies in late summer – will be among the big winners as levels of carbon dioxide in the atmosphere increase. Invasive crop pests and plant diseases are likely to increase too as a result of global warming. Commercial horticulture in areas with more extreme temperatures to begin with (such as the state of Himachal in India) are also already finding the more variable temperatures climate change has so far brought about impediments to business as usual.
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