The current reduction of 0.1 in pH that has occurred over the industrial era translates to a 30 % increase in ocean acidity. This change has occurred at a rate that is about a hundred times faster than any change in acidity experienced during the past 55 million of years. A further decline of 0.3-0.4 pH units, projected for surface waters during the 21st century, represents a 100-150 % increase in acidity.
When the urge to give flowers takes you, choose a potted plant from a local supplier. A lot of exotic flowers are grown in greenhouses great distances away. Aside from the issue of transport, there can be high social and environmental costs. For example, in Colombia, the flower industry uses enormous quantities of polluting pesticides, and in Kenya, horticulture requires a lot of water which reduces local water resources. As an alternative ask your flower shop for Fairtrade or organically produced flowers.
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