We were on our home last Sunday from our house in Montalban when my kids asked why the Sierra Madre mountain is brown. And indeed, why o why? I cant very much see from where our car was but I am guessing its because of the quarrying in the mountain. Montalban was flooded during Ondoy and then again during Habagat. I hope we take care more of our mountains. I want my kids to still be able to enjoy these mountains!