31.   A further difficulty is that there are as yet few opportunities to invest in solar power generators or other green technologies.

32.   A New York firm has designed an ice cream pushcart cooled by solar power.

33.   A few energy companies have branched out into low- or no-emission projects like fuel cells or solar power.

34.   A generation after the possibilities of solar power burst forth with the oil crises, the untapped potential of the sun is quietly blossoming into a promising industry.

35.   Alternative sources of energy, such as solar power, are still more expensive.

36.   British Petroleum Corp. is investing in solar power, and Enron Corp. created a renewables division when it bought wind-power provider Zond Corp.

37.   But even in northern climates, solar power could have an important role.

38.   But given consumer expectations that electricity should remain relatively cheap, stimulating a large domestic market for solar power will not be easy.

39.   But Senator Kerry countered that it would be better to increase use of renewable energies, such as wind power and solar power, while increasing energy conservation measures.