More than 150 countries are expected to participate in this year&rsquos World Environment Day on 5 June, while millions are likely to engage through in-person and online activities. Hosted by Côte d&rsquoIvoire and supported by the Netherlands, this year&rsquos theme focuses on solutions to plastic pollution. The stakes could not be higher, as humanity produces over 430 million tonnes of plastic annually, two-thirds of which are short-lived products that soon become waste. While the social and economic costs of plastic pollution range between $US300 to US$600 billion per year.