Specialists urge measurable outcomes and stronger commitments linking climate, water and sustainability.
Industry representative says rainfall patterns and low drought risk support production outlook.
More than 5,000 participants from over 180 countries, including over 120 ministers and 200 mayors, expected to attend global sustainability gathering.
Le Monde report warns revision of climate scenarios reflects real-world developments rather than overstatement of risks.
Temperatures could climb above 38C across parts of Spain and France, while UK faces 'extraordinary' heat health alerts as forecasters warn of powerful 'heat dome' driving conditions more than 10C above seasonal norms.