* Greenhouse gas penalties seen as main source of cash
* Feasible to raise $100 bln a year from 2020-Stoltenberg
* Sources from national taxes to global shipping, aviation
OSLO, Oct 10 (Reuters) – More penalties on greenhouse gas emissions could help raise $100 billion a year from 2020 to enable poor nations to slow global warming, despite austerity in many rich countries, Norway’s prime minister said.
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