A field is sprinkled with the remnants of cotton after a harvest in Trangie, Australia, September 4, 2019. The parched earth of Australia's longest waterway, if tributaries are included, is in the grip of the continent's most severe drought in a century. Drought is weighing on economic growth, and the dire conditions have prompted Australia, a major wheat exporter, to import the grain for the first time in 12 years. REUTERS/Tracey Nearmy SEARCH "NEARMY DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.