THE STRAITS TIMES – On the morning of Sept 15, 12 people combed a stretch of the Rail Corridor to snip away fast-growing creepers and dig up tubers that could suffocate native trees in the forest. Armed with small hoes and pruning shears, the volunteers and staff of WWF-Singapore got rid of eight gunny sacks’ worth of foreign weeds that were entangling trees in 1½ hours.