At least 30,000 ash trees are due to be felled by the National Trust this year at a cost of £3m due to dieback, as the charity warns of a “catastrophic” increase in tree and plant disease because of climate breakdown.  Changing weather patterns are expected to cause pests and diseases that destroy trees to thrive, which could bring dramatic change to British landscapes.  The charity has released aerial images showing how this is already happening with some species. For example, tens of thousands of larch trees will be felled due to Phytophthora ramorum, affecting views such as Tarn Hows in the Lake District.  The spread of the fungus-based pathogen is accelerating across the Lakes and in some sites it is predicted that 75% of larch in the woodland will be lost. Foresters in the area expect 95% of their time will be spent dealing with the disease.