Day 131 — Integrated Review: Coherence(TEEL) + Matching Headings + 倒置構文Inversion + Map描写 + Section4講義聴解の複合定着

Good morning. Today's topic is vertical farming — growing crops in stacked layers indoors rather than in open fields. Traditional agriculture requires roughly one hectare of land to produce, say, 5 tonnes of lettuce per year; a vertical farm using the same footprint can produce more than 20 times that amount, because growing trays are stacked as many as ten layers high.

Let's look at how it works. Plants are grown hydroponically — that is, without soil, with nutrients delivered directly through water — under LED lighting tuned to the specific wavelengths plants need for photosynthesis. Actually, in some newer experimental systems, aeroponics is used instead, where roots are misted with a nutrient solution rather than submerged, but hydroponics remains far more common in commercial operations today.

So why hasn't vertical farming replaced traditional agriculture? The first obstacle is energy cost — running LED lighting around the clock is extremely expensive, and in most current operations, electricity accounts for well over half of total running costs. A second obstacle is the limited range of crops that are commercially viable; leafy greens and herbs grow well, but staple crops like wheat and rice are, for now, far too energy-intensive to grow this way profitably.

Let's move on to a promising recent development — researchers have started integrating on-site renewable energy, particularly rooftop solar, to offset some of the electricity costs.

Paragraph A. The rise of urban beekeeping over the past decade has been driven largely by ecological concern. As reports of declining wild pollinator populations have become more widespread, many city residents have taken up beekeeping as a way of directly supporting local pollination, while a smaller but growing number are drawn simply by the appeal of harvesting their own honey from rooftops and balconies.

Paragraph B. In practice, however, hobbyist beekeepers face several obstacles. Urban hives are more susceptible to certain diseases, partly because of the higher density of colonies in a small area, and forage — the flowers and blossoms bees rely on for nectar — can be scarce or unpredictable in built-up environments, forcing many keepers to supplement their bees' diet artificially during lean periods.

Paragraph C. Perhaps the most contentious issue, though, is how tightly the practice should be regulated. Some city councils require hives to be registered and inspected, arguing that this is necessary to prevent disease outbreaks and to protect neighbours who may be allergic to stings; beekeeping associations, meanwhile, argue that overly strict rules discourage newcomers and do little to address the underlying ecological problem the hobby was meant to help solve.