Feature Article

As India's capital, Delhi has grown across sectors - industry, transport, and housing - which contribute to an increase in air pollution. This, in turn, has increased health risks, which are refl ected in a rise in respiratory ailments. While the benefi ts of some interventions in the transport sector have been apparent, it is time to focus on low-hanging fruit in other sectors in order to improve air quality and public health in the city.

The 20-year commemoration of the historic Earth Summit produced nothing except more words. (Editorial)

Weight loss is no more a simple calculation of calories consumed and burnt. Studies show exposure to certain toxins in the environment can make it difficult for one to shed extra pounds. What are these toxins? How do they affect body?

Peat bogs are primarily situated at mid to high latitudes and future climatic change projections indicate that these areas may become increasingly wetter and warmer. Methane emissions from peat bogs are reduced by symbiotic methane oxidizing bacteria (methanotrophs). Higher temperatures and increasing water levels will enhance methane production, but also methane oxidation. To unravel the temperature effect on methane and carbon cycling, a set of mesocosm experiments were executed, where intact peat cores containing actively growing Sphagnum were incubated at 5, 10, 15, 20, and 25°C.

Extensive use of chromium (Cr) and arsenic (As) based preservatives from the leather tanning industry in Pakistan has had a deleterious effect on the soils surrounding production facilities. Bacteria have been shown to be an active component in the geochemical cycling of both Cr and As, but it is unknown how these compounds affect microbial community composition or the prevalence and form of metal resistance. Therefore, we sought to understand the effects that long-term exposure to As and Cr had on the diversity and structure of soil microbial communities.

The purpose of this study is to investigate the current status of metal pollution of the sediments from urban-stream, estuary and Jinzhou Bay of the coastal industrial city, NE China. Forty surface sediment samples from river, estuary and bay and one sediment core from Jinzhou bay were collected and analyzed for heavy metal concentrations of Cu, Zn, Pb, Cd, Ni and Mn.

In East Africa, human population growth and demands for natural resources cause forest loss contributing to increased carbon emissions and reduced biodiversity. Protected Areas (PAs) are intended to conserve habitats and species. Variability in PA effectiveness and ‘leakage’ (here defined as displacement of deforestation) may lead to different trends in forest loss within, and adjacent to, existing PAs.

In yet another blow to the survivors of the Bhopal gas disaster, a US district court has dismissed a plea seeking to make Union Carbide liable for contamination caused by its pesticide plant in Bhopal. Seventeen survivors of the 1984 gas leak tragedy had filed a case against the corporation in 1999 in the US district court in Manhattan.

Carson no ‘beacon of reason’ on DDT. (Correspondence)