Too Vague For Planning?

After Brexit, UK farmers were told by their government that the Common Agricultural Policy subsidies would be replaced by Environmental Land Management (ELM) contracts (https://www.theguardian.com/environment/2022/jan/23/farmers-tree-dilemma-if-we-plant-woodland-will-we-take-a-cash-hit). Farmers were told that from 2024, ELM contracts would be issued to pay for any work that benefitted the land and wildlife. Some farmers are now claiming, however, that there are still (4 years later!) too few details about ELM's for them to risk some investments. Farmers claim that they are uncertain, for example, whether planting trees on their land, will be properly rewarded. Government has made much of the importance of planting trees to reduce 'greenhouse gas' emissions and stem the loss of wildlife. There appear to be few firm details on sizes of qualifying planted areas, likely durations of payments and species (mixtures) of trees to be used. One might have thought, given the climate crisis, there would be some urgency about giving farmers the answers.