Guardian: This is all uphill work. Literally. We are puffing away in the high Andes of Peru at 3,800m (over 11,000 ft), where the air is thin and the sun burns hard. But the testimonies of small farmers about a rapidly-changing climate are now coming thick and fast. We have spent the day in villages about 70 miles south east of Cusco talking about the changes they have observed and experienced in the last few years. Here’s just three of the many we heard, from the village of …