HumansRealising slavery's environmental impact will hasten its end Aside from its obvious injustice, slavery also has a disproportionate effect on the climate. Recognising this could add new impetus to end it, says Kevin BalesComment
HumansState of the science: The real message in Obama's last address In his final State of the Union address, Barack Obama talked up the need for Americans to set aside ideology and heed the evidence, says Andrew RosenbergComment