325-metre-high climate research tower is being built in the Amazon rainforest

When Jürgen Kesselmeier wants to travel to the building site of the Amazonian Tall Tower Observatory (Atto), he faces a day and a half's journey from the Brazilian metropolis of Manaus. He starts by car heading north, then turns east to the Balbina Dam, and continues further along the Uatumã River. Following a boat trip, the final leg of the journey is made by jeep along a jungle track. "Apart from the measurement station with two smaller 80-metre-tall towers, all there is here is forest," say