Kenya’s leader wants a paved road to cut through a forest, a key water source. Scientists don’t

ABERDARE RANGE, Kenya — In a dense layer of green thousands of feet above sea level, cedar, podo and hegeina trees pattern the landscape, thick moss hanging from their branches and feathery lichen attached to their barks. Numerous streams and rivers flow between them, plunging over steep waterfalls. Buffaloes, bushbucks and monkeys roam in search…