(28)The legal boundaries for transitional activities set out in Article 10(2) of Regulation (EU) 2020/852 provide constraints in respect to greenhouse gas intensive activities with large potential for emission reduction. Such transitional activities should make a substantial contribution to climate change mitigation where no technologically and economically feasible low carbon alternative exists, provided they are compatible with a pathway to limit the temperature increase to 1,5 °C above pre-industrial levels, reflect best-in-class performance, do not hamper the development and deployment of low-carbon alternatives and do not lead to lock-in of carbon-intensive assets. In addition, Article 19 of the same Regulation requires, in particular, that the technical screening criteria should be based on conclusive scientific evidence. Where natural gas activities fulfil those requirements, they will be included in a future delegated act. For these activities, the technical screening criteria for assessing substantial contribution to climate change mitigation and ‘do no significant harm’ to other environmental objectives will be specified in that future delegated act. Activities that do not meet these requirements cannot be recognised under the Regulation (EU) 2020/852. In order to acknowledge the role of natural gas as an important technology in reducing greenhouse gas emissions, the Commission will consider a specific legislation to ensure that activities contributing to emissions reductions would not be deprived of appropriate financing.