Pres. Clinton will propose a $2.4 billion package of programs to combat global warming, including $200 million to promote the sales of energy-efficient U.S. technology abroad, White House officials said yesterday. That’s a 40 percent increase over what Congress approved for similar programs last year, but White House environmental staffer Roger Ballantine said the administration is optimistic about passage because U.S. businesses are eager to sell environmentally friendly products to other nations. The package is intended to spur U.S. involvement in what some experts project will be a $4 trillion to $5 trillion market in developing countries for new energy-efficient and clean-energy technology over the next 20 years. Clinton is also proposing tax credits of up to $4,000 for buyers of clean cars and energy-efficient homes.