ANKARA   Plastic waste leakage to the environment in Southeast Asian countries, plus China, Japan, and South Korea, could increase by nearly 70% if effective measures are not taken, warned a report by the Organization for Economic Cooperation and Development (OECD). "Driven by rising incomes and living standards, plastics use in the region is projected to almost double in the absence of more ambitious policies," the Regional Plastics Outlook report said, comparing the figures to 2022 levels.