Cash Flows from Operating Activities
Net cash used in operating activities was
$77 millionfor the six months ended June 30, 2013compared to net cash used in operating activities of $18 millionin the same period last year. Changes in key working capital accounts are summarized below: Favorable (unfavorable) Six months ended Six months ended (In millions) June 30, 2013 June 30, 2012 Accounts receivable $ (147 ) $ (136 ) Inventories (60 ) (36 ) Accounts payable 74 55 Pension and post-retirement health care liabilities (28 ) (53 ) During the six months ended June 30, 2013, accounts receivable increased by $147 millionover December 31, 2012primarily driven by our Consumer Products and Chemtura AgroSolutions segments as a result of typical seasonal increase in demand as suppliers initially begin stocking for the upcoming pool and growing seasons in North Americaand Europeand then record higher sales levels in Chemtura AgroSolutions. Additionally, our Industrial Performance segment showed some increase in accounts receivable driven entirely by the favorable volume growth this segment experienced in the past several months. Inventory increased by $60 millionover December 31, 2012primarily driven by seasonal inventory build in our Consumer Products segment. Industrial Performance Products reported some increase in inventory to support increased demand while our Industrial Engineered segment built inventory due to the reduction in demand and product mix we saw over the first half of the year. Accounts payable increased by $74 millionin the six months ended June 30, 2013primarily relating to our Consumer Products, Chemtura AgroSolutions and Industrial Performance segments as a result of the seasonal demand required inventory build. Pension and post-retirement health care liabilities decreased $28 millionprimarily due to the lower funding of benefit obligations. Pension and post-retirement contributions amounted to $22 millionfor the six months ended June 30, 2013which included $7 millionfor domestic plans and $15 millionfor international plans.