Biggest tree in danger

The world’s biggest and most magnificent trees face a dire future, thanks to logging, deforestation, pest invasions and effects of climate change. William Laurance, Professor at James Cook University, warned that their demise will have substantial impact on bio diversity and forest ecology and worsen climate change too. Reviewing research from forests around the world, Laurance wrote in the New Scientist magazine that “big trees need a safe place to live and long periods of stability. But time and stability are becoming very rare commodities in our modern world”.

Giant trees offer critical habitat and forage for wildlife, while transpiring massive amounts of water through their leaves contributing to local rainfall. Old trees also lock up massive amounts of carbon. “But their ability to sequester carbon and render other ecosystem services is threatened by human activities. Some of the world’s largest trees are particularly targeted by loggers. “The oldest trees are among the most valuable and therefore the first to be cut in ‘virgin’ forest areas,” he said, according to a university statement. “Big trees are also sensitive to habitat fragmentation, which exposes them to stronger winds and drier conditions,” he said.

Hong Kong’s air quality getting worse

Air pollution levels in Hong Kong were the worst ever last year, the South China Morning Post reported on January 10, a finding that may further undermine the city’s role as an Asian financial center as business executives relocate because of health concerns.

Worsening air quality in Hong Kong caused by vehicle emissions and industrial pollution from the neighboring Pearl River Delta is already forcing many in the financial community to move to Singapore.

Readings at three roadside monitoring stations in Hong Kong’s Central, Causeway Bay and Mong Kok commercial districts showed that pollution levels were above the 100 mark more than 20 per cent of the time, the newspaper said, citing the city’s Environmental Protection Department.

This was 10 times worse than in 2005, when very high readings were recorded only two per cent of the time, it said. The station in Central business district, home to the Asia head- quarters of global banks such as HSBC Holdings Plc and Goldman Sachs Group Inc, showed the worst figures, with excessive readings a quarter of the time, the report said. Hourly readings are taken at the roadside stations throughout the year on major pollutants such as respirable suspended particles and nitrogen oxides. A reading above 100 means at least one pollutant fails air quality objectives.        hongkong-air-pollution

Environmentalists renewed their calls for the immediate introduction of new air quality objectives, claiming that the government had deliberately delayed their introduction to ease the way for major infrastructure projects, the newspaper said.

The department blamed the figures on unfavorable weather conditions, worsening background, pollution and the number of aging vehicles on streets. The newspaper quoted the government as saying a number of measures were being considered to help improve air quality, and new air quality objectives would be discussed by Hong Kong’s legislature soon.