More productive land being used for urban development, study findsOfficials advise softer is better when it comes to boot campsUS, Japan and South Korea agree to expand security and economic ties at historic Camp David summitChina news: Mystery as Xi Jinping unexpectedly skips key speechChina economy update: Evergrande shares plunge 70 per centChina news: Mystery as Xi Jinping unexpectedly skips key speechChina news: Mystery as Xi Jinping unexpectedly skips key speechTrump asks appeals court to overturn ruling on Georgia prosecutorIsraeli military says troops captured hundreds of fighters in Gaza hospitalFour killed, several injured as race car hits spectators at Hungary rally