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In this Dec. 7, 2018 photo Dirk Gratzel walks with his dog at his hunting ground in Stollberg, western Germany. Gratzel counts his carbon emissions. The software entrepreneur from Germany is among a growing number of people looking for ways to cut their personal greenhouse gas emissions from levels that scientists say are unsustainable if global warming is to be curbed.  (AP Photo/Martin Meissner)

In this Dec. 7, 2018 photo Dirk Gratzel walks with his dog at his hunting ground in Stollberg, western Germany. Gratzel counts his carbon emissions. The software entrepreneur from Germany is among a growing number of people looking for ways to cut their personal greenhouse gas emissions from levels that scientists say are unsustainable if global warming is to be curbed. (AP Photo/Martin Meissner)

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