By Kate Abnett and Philip Blenkinsop BRUSSELS (Reuters) -The European Commission is set to delay the publication of proposals on sustainable farming and nature that were expected this week, with the impact of the war in Ukraine on food supply leading some countries to question the European Union’s environmental push. The EU’s “Green Deal” is overhauling all sectors, including agriculture, which produces roughly 10% of EU greenhouse gas emissions. Brussels has targets that include halving chemical pesticide use by 2030, and is drafting laws to make them a reality. The EC was due to have made pu…