Honolulu Advertiser: Hawai’i could become the first state in the country to require that all new single-family homes come equipped with energy-saving solar water heaters. Lawmakers last week approved the mandate, which advocates say would save new homeowners hundreds of dollars a year in electricity costs and help reduce Hawai’i’s use of fossil fuels. It’s among several environmental bills the Legislature sent to Gov. Linda Lingle last week, ranging from establishing an electronic waste recycling …