But Onitsha, say academics, is a textbook example of the perils of rapid urbanisation without planning or public services creating a sustained pollution assault on its water and air.
Importantly, the study assesses 2 years independently for confirmation, yet we are not able to draw any conclusions regarding effects of sustained pollution exposure over time or of prior exposure on incident disease.
This concentration should be considered as the resistance r or the capacity of the environment to sustain pollution.
At the same time, an important difference between these studies and ours is that we are dealing with a relatively short but intense pollution shock, while they study a sustained decrease in pollution over time.
Yet the impact of sustained exposure to pollution on a person's life expectancy has largely remained a vexingly unanswered question until now.
These perturbations, combined with lower-level sustained disturbances such as pollution, low-impact logging/farming, and climate shifts, could cause the baseline of many of the studies reviewed here to be far removed from a distant historical natural state.
Higher BC levels were also associated with lower between-test ST-segment levels, when averaged (for each individual, for each testing session) over all portions of the protocol (12-hr mean BC: estimated overall ST-segment change = −0.08 mm; p = 0.03; 5-hr BC: estimated change = −0.10 mm; p = 0.004), suggesting a pollution effect sustained throughout the protocol.
Although we were unable to find detailed information on the distribution of pollutants in northern and southern China, we expect a difference would certainly exist between these locations, as was reported in a recent study that examined the impact of sustained exposure to air pollution on life expectancy around the Huai River in China [34].
Let us use all the science necessary for pollution-free, sustained development.
In the 1990s the six Black Sea countries signed the Convention on the Protection of the Black Sea Against Pollution (also called Bucharest Convention), a comprehensive agreement to implement an array of additional programs to control pollution, sustain the fisheries, and protect marine life.
This SDG would consider several landscape targets, like livelihood provision, sustained ecosystem services, control of pollution (especially carbon emissions, the central cause of climate change), resource efficiency and the production of food and non-food products – all benefits that forests provide or play a role in providing.
