Information helps users decide when, and whether, to venture outside or exercise
Companies that report emissions appear greener only in a narrow measure
Breakthrough technologies are years off for aviation, but incremental improvements are available
What emerges is a fragmented view of corporate contribution to global warming
Tough standards led to an increase in auto-related patents
Paying airlines to scrap — instead of sell — old planes produces environmental benefits at a low cost
Far from burn zones, especially for renters and those with iffy credit, money troubles follow fires