Punjab is expanding its Liquid Tree initiative to combat urban air pollution, using algae-based systems that absorb carbon dioxide and improve air quality where conventional trees cannot be planted. The initiative has drawn praise, but also highlights Karachi’s shortcomings in preserving its green cover.
Liquid Trees: An Innovative Solution
The Liquid Tree, or photobioreactor, uses microalgae to capture CO2 and release oxygen, functioning in dense urban areas where planting trees is not feasible. Punjab’s expansion aims to install more units in high-pollution zones, supplementing traditional tree planting efforts.
Karachi’s Deforestation Problem
While Punjab innovates, Karachi continues to cut down existing trees without explanation or replacement. According to a concerned citizen, Sarah MacArthur of Karachi, “Every morning, I pass another freshly cut tree stump with no explanation and no replacement.” She notes that the city replaces trees with concrete, exacerbating air pollution and heat.
Karachi does not yet need liquid trees as much as it needs to stop cutting down real ones. The city’s green cover is diminishing, leading to worsened air quality and rising temperatures. Officials have not provided a clear policy for tree preservation or replanting.
Budgetary Context
Separately, the provincial assembly approved Rs270.5 billion demands for grants as the government defended its budget. This allocation includes funds for environmental projects, but critics argue more is needed for urban forestry and pollution control.
Call for Action
Environmentalists urge Karachi’s authorities to halt indiscriminate tree cutting and implement a replanting strategy. Without immediate action, the city’s liveability will continue to decline. As MacArthur warns, “It would be encouraging if those responsible took notice before it is too late.”
