Airlines' fuel practices feed doubts over climate commitment

Airlines have taken steps to reduce their carbon footprints under the gaze of public opinion, but the pressure of the bottom line means some fly with extra fuel, boosting emissions of climate-changing greenhouse gases.

UN floats plan to boost renewables as climate worries mount

The United Nations chief on Wednesday launched a five-point plan to jump-start broader use of renewable energies, hoping to revive world attention on climate change as the U.N.'s weather agency said greenhouse gas concentrations, ...

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