LONDON, May 19 (Reuters) - Forty major food and agriculture groups, including Carlsberg, Diageo, Nestle and Mondelez, have signed a joint declaration to advance and scale regenerative agriculture, a non-profit network said on Tuesday.   

o SAI Platform's regenerative agriculture programme aims to address climate change, biodiversity loss and soil degradation while securing agricultural supply chains.

o Signatories, which include ADM, McCormick and Unilever, said no single organisation or solution can drive the systemic change required.

o SAI Platform's programme incorporates input from farmers, NGOs and academics to align efforts across the supply chain.

o "We need alignment and collaboration - not isolated efforts," said Simon Boas Hoffmeyer, VP, Global Head of Sustainability & ESG, Carlsberg Group.

(Reporting by Alexander Marrow; Editing by Alexander Smith)