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Re:Eon Switches All U.K. Customers to Renewable Power by mrweasel on Tuesday July 09, 2019 @06:35AM (#20390448)
Carbon credits/offset certificates really shouldn't be allowed to be included when talking about 100% renewable energy. In fact I don't think carbon credits should exists.

We had the issue with sulfur dioxide in the late 80', early 90', but there where no SO2 credits, no offsets, just hard caps until the issue was resolved.

Re:Eon Switches All U.K. Customers to Renewable Power by icebraining on Tuesday July 09, 2019 @07:16AM (#20390661)
They did exactly that with SO2:

In the US, the 1990 Clean Air Act Amendments established an emissions trading system to reduce emissions of SO2 from fossil-fuel burning power plants located in the continental 48 states of the United States. (...) Caps on emissions were implemented by issuing tradable allowances that in total equalled the annual cap level. To comply, sources were required to surrender one allowance for each ton of emissions. (...)

https://www2.dmu.dk/atmosphericenvironment/expost/database/d...