United in Science: High-level Synthesis Report of Latest Climate Science Information convened by the Science Advisory Group of the UN Climate Action Summit 2019

This report synthesises recent climate science findings from multiple international organisations to present a unified assessment of changes in the Earth system, human influences, and projected future impacts. It compiles observational data, emission trends, and scientific analyses covering temperature rise, sea level change, greenhouse gas concentrations, and extreme events, alongside evaluation of policy commitments and emission gaps. The document draws on published evidence to describe current climate conditions, drivers such as fossil fuel use and land activities, and implications for ecosystems, economies, and human wellbeing. It also outlines scientific projections, risks of tipping points, and the role of climate information services in supporting adaptation and decision-making.