Berkshire Hathaway Inc. on Friday urged the rejection of four shareholder proposals recommending that it replace Warren Buffett as chairman, report on its plans to handle climate risk and reduce greenhouse gases, and improve diversity. The company, run by Buffett since 1965, also said the 91-year-old received $373,204 in compensation for 2021, down from $380,328 a year earlier, comprising his usual $100,000 salary plus personal and home security. Though Buffett’s salary is low for a chief executive officer of a major company, his 16.2 percent Berkshire stake comprises most of his $117.9 billion net worth, which Forbes magazine said makes him the world’s fifth-richest person. Berkshire disclosed Buffett’s pay and recommendations on shareholder proposals in its annual proxy filing, ahead of the Omaha, Nebraska-based company’s April 30 annual meeting. It also said Vice Chairmen Greg Abel and Ajit Jain, who respectively oversee Berkshire’s non-insurance and insurance operations, were in 2021 …