Emission penalty makes the model go for CCS

[HauHe]

In scenarios with CO2 penalties the model goes strongly into CCS, not only balancing emissions from fossil fuels but producing large amounts of negative emissions, and by that reducing the costs.
In an emission trading system this could happen but the price/penalty would drop if the positive emissions are compensated by negative emissions, unlike in the model where the penalty remains as defined...

[HauHe]

@willu47 , @EmiFej , any ideas how to fix this? Of course we could implement a limit related to estimates how much CO2 could be stored annually, but that wouldn't really fix the underlying problem, would it?