Officials in Vietnam's traffic-choked capital Hanoi vowed on Tuesday to banish motorbikes by 2030 to ease environment and congestion woes, a decision that swiftly divided a city where two-wheelers are the main means of transportation.

The U.S. decision to withdraw from the Paris climate agreement has given a "global push" to the deal, as other signatories have strongly recommitted to the landmark accord, U.N. chief Antonio Guterres said Monday.

China is drilling deep into the ocean floor in the hope of tapping vast deposits of a frozen fossil fuel known as "combustible ice" but it will be years before it is part of the global energy mix.

German Chancellor Angela Merkel said Thursday that Europe was "more determined than ever" to fight climate change after President Donald Trump pulled the United States out of the Paris agreement.

Multinationals worth $3.5 trillion and financial institutions managing $25 trillion in assets pledged on Thursday to follow new guidelines for disclosing exposure to climate change risk in both operations and investments.

Spearheaded by former New York mayor Michael Bloomberg, recommendations by the Task Force on Climate-related Financial Disclosures should help shareholders determine if businesses are aligned with the global shift toward a low-carbon economy, and not unduly burdened with assets that could be stranded during that transition.

President Donald Trump's decision to pull out of the Paris climate accord has triggered a bipartisan push from U.S. mayors to stick to the emissions cuts Washington had pledged to hit, the mayor of Atlanta said Tuesday.

Dozens of city mayors from around the world -- including Washington, Berlin, Paris, Tokyo and Sydney -- on Monday called on G20 leaders to stick to their commitments on tackling climate change.

Hollywood star turned activist Arnold Schwarzenegger joined politicians and legal experts in Paris Saturday to launch a campaign for a global pact to protect the human right to a clean, healthy environment.

Former California governor Arnold Schwarzenegger urged people from both ends of the political spectrum to join a "crusade" to save the planet, after a Friday meeting with French President Emmanuel Macron.

France is to stop granting new licences for oil and gas exploration on the mainland and in overseas territories, Environment Minister Nicolas Hulot said Friday.