International climate finance mechanisms have committed to mobilising significant annual funding to help developing countries both adapt to climate impacts already underway and pursue lower-emissions growth paths, recognising that these countries bear a disproportionately small share of historical emissions yet often face some of the most severe climate risks.

With reference to the above passage, the following assumptions have been made:

1. Developing countries are solely responsible for causing climate change.

2. Developing countries face significant climate risks despite a small historical contribution to global emissions.

Which of the above assumptions is/are valid?