What's being said on facebook.com/southchinamorningpost

On the introduction of the law restricting idling engines:

Sam Ho - Turning off the idling engine and turning it on again within a short period of time will generate even more pollution, as experts have proved. This scheme, it seems, is just a scam by government officials to prove that they have done something to curb air pollution.

Kelvin Ng - This so-called scheme is a just a scam by environment officials to cover up their failure in abating roadside air pollution. How much do idling engines contribute to total toxic fumes emitted by vehicles like buses, lorries, trucks, PLBs, and taxis - 0.01 per cent, 0.1 per cent, 1 per cent? I challenge the environment secretary to provide HK people with that figure. Yet he has wasted billions of dollars of public money and much hassle to all drivers and passengers to push through this stupid policy when he has absolutely no policy at all on how to tackle the grave air pollution problem.

On HK topping the World Economic Forum's Financial Development Index:

Keith Timothy Jones - Good financial place, but increasingly degrading living conditions.

Wendy Yap - More social and environmental problems to come.

Kelvin Lam - HK is the No 1 financial centre, with the largest disparity between the rich and the poor.

Seafood is the biggest source of dangerous toxins:

David Samuel Wieland - It's already a widely known phenomenon that fish siphon the chemical constitution of their environment - eel and tuna contain trace amounts of mercury and other heavy metals.

Brandon Wong - Somehow, I'm not sure that this news is going to stop insane amounts of seafood being eaten... you need something more 'deadly'.