I-US Forest Service inselele ukuthi uphumele ngaphandle futhi uthathe izithombe zehlathi lakho lasemadolobheni noma lomphakathi. Ungawina u-$200 ngegiya langaphandle ku-National Forest Foundation.
Ukuze ufunde imithetho egcwele yomncintiswano noma uthumele isithombe, vakashela urbanforest.challenge.gov.