CHIBA — The Group of 20 environment and energy ministers vowed Sunday to continue their fight against global warming but fell short of reaching a consensus on a framework to succeed the 1997 Kyoto Protocol.

"Participating countries share the belief that all nations must join action" to reduce carbon dioxide emissions, trade minister Akira Amari told reporters after the two-day ministerial meeting in Chiba.

Some countries, however, expressed concern over newly proposed schemes, Amari added.