Environmental Research Letters
Microplastic debris floating at the ocean surface can harm marine life. Understanding the severity of this harm requires knowledge of plastic abundance and distributions. Dozens of expeditions measuring microplastics have been carried out since the 1970s, but they ha...ve primarily focused on the North Atlantic and North Pacific accumulation zones, with much sparser coverage elsewhere. Here, we use the largest dataset of microplastic measurements assembled to date to assess the confidence we can have in global estimates of microplastic abundance and mass. We use a rigorous statistical framework to standardize a global dataset of plastic marine debris measured using surface-trawling plankton nets and coupled this with three different ocean circulation models to spatially interpolate the observations. Our estimates show that the accumulated number of microplastic particles in 2014 ranges from 15 to 51 trillion particles, weighing between 93 and 236 thousand metric tons, which is only approximately 1% of global plastic waste estimated to enter the ocean in the year 2010. These estimates are larger than previous global estimates, but vary widely because the scarcity of data in most of the world ocean, differences in model formulations, and fundamental knowledge gaps in the sources, transformations and fates of microplastics in the ocean.
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A Handbook to Support Strengthening of Organisational Capacity in Developing Information, Education and Communication (IEC) Materials for Lesbian, Gay, Bisexual, Transgender and Intersex (LGBTI) People in Southern Africa Accessed 7 July 2015
Briefing Note no. 80 November 2015
December 2015
National guidelines for of Clubfoot
The intention of this document is to clarify and outline the steps to effective cholera surveillance. It discusses when,
where and why surveillance for cholera is needed and how to establish a useful and cost-effective surveillance
system for cholera. To make comments, corrections and additions,... please contact the authors at stopchol@jhsph.
edu or jhsph.stopchol@jhu.edu.
Check also: DOVE Project www.stopcholera.org
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