Walmart`s share price increases significantly on 10 October after optimistic earnings guidance and a $20bn share buyback programme was announced by the company before its annual investor day meeting. It`s stock rose 4.5% to $84.13, taking its year-to-date gain to almost 22%. Walmart expected earnings to climb 5% in the next fiscal year as its investment in ecommerce continued to pay off. End of September Walmart announced an update to its sustainable chemistry policy on consumables, which had resulted in a 96% reduction in the weight of high-priority chemicals. Its new commitments set a goal of reducing Walmart’s chemicals footprint by 10% by 2022, affecting over 55 million pounds of priority chemicals. The company has been working with the  Environmental Defense Fund on defining science-based targets and a framework for corporate leadership to protect consumer health.