ScienceNews: Climate scientists need your help — not by sending up weather balloons or drilling ice cores in Antarctica, but by turning on your computer. Researchers are using crowdsourcing to digitize reams of historical weather data, filling gaps in existing 20th century records and extending their coverage back in time to the period before the Industrial Revolution. Anyone with an Internet connection can help scientists read the century-old logbooks where ship hands on British naval vessels scrawled…