The Business Roundtable, representing chief executives of more than 200 of the largest U.S. companies, yesterday called for a national summit to discuss ways business and government can speed the development of energy-efficient technologies. The group touted the great potential of new energy-related technologies to curb global warming and cut businesses’ production costs. The Roundtable remains opposed to the Kyoto climate change agreement, however, prompting Environmental Defense Fund Pres. Fred Krupp to call the group’s latest stance “hypocritical” because it still wants the government to put money into research and development for new technologies.