Sunday Herald: INDUSTRIOUS AND affable, the humble bumblebee heralds the arrival of springtime and is a harbinger of long, hot summers. But they have been spotted earlier than ever before this year, prompting fears that climate change could be the last nail in the coffin for the endangered insect. Intensive farming and habitat destruction have already caused populations to crash. Now experts fear that global warming could finish off the bumblebee. Usually queens awake from hibernation in …