The Montreal Protocol and the Paris Agreement both address global gas emissions resulting in unwanted impacts on human health and natural ecosystems. Unfortunately, this is where the similarities end.
Despite Saudi promises to mitigate climate change, the Kingdom thwarts international efforts at collaboration.
UN Secretary General Antonio Guterres warned of an impending "climate catastrophe", while environmental campaigner Greta Thunberg dismissed the COP26 climate conference deal as "blah, blah, blah".
Several countries, including small island states, say they are deeply disappointed by the move to "phase down" rather than "phase out" coal power, the single biggest source of greenhouse gas emissions.
Negotiations on a deal to continue into Saturday afternoon as delegates from nearly 200 nations are still trying to find common ground on the phasing out of coal and financial aid for poor countries.
The deal was broadly welcomed by global leaders and climate experts amid criticism the UN climate conference was falling far short of its goals.
Green groups were less than thrilled with the declaration, arguing it allows "for delay tactics and fossil fuel loopholes".
A climate research group has urged all governments to reconsider their climate targets, warning that even with new Glasgow pledges for 2030, greenhouse gas emissions will be roughly twice as much a decade from now.
Obama criticised the Chinese and Russian presidents for not joining other global leaders at the climate talks in Glasgow.
More than a third of the world’s nations “urgently need help” to build up resilience if their economies are to withstand the effects of global warming.
British Prime Minister Boris Johnson says the Glasgow Leaders' Declaration on Forest and Land Use is an "unprecedented agreement."
United Nations Secretary General Antonio Guterres warns that “we are digging our own graves” as he calls on countries to act to protect the planet from global warming.
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