Allowing for the usual quotient of Sir Humphrey-esque blather, the G20 closing statement actually says some things. For example --
The Leaders of the other (non-USA) G20 members state that the Paris Agreement is irreversible. We reiterate the importance of fulfilling the UNFCCC commitment by developed countries in providing means of implementation including financial resources to assist developing countries with respect to both mitigation and adaptation actions in line with Paris outcomes and note the OECD’s report “Investing in Climate, Investing in Growth”. We reaffirm our strong commitment to the Paris Agreement, moving swiftly towards its full implementation in accordance with the principle of common but differentiated responsibilities and respective capabilities, in the light of different national circumstances and, to this end, we agree to the G20 Hamburg Climate and Energy Action Plan for Growth as set out in the Annex.
That means in particular that Saudi Arabia committed itself to the Paris Agreement, while the Trump administration didn't.
Photo: via G20 Presidency website, head of Saudi Arabian delegation Ibrahim al-Assaf with Angela Merkel.