degrading the sea, also affect the species that live in this habitat, without having been
able to stop this conflictive situation.
In addition, Grover et al. (2020) states that there has been an exponential growth in the
pollution of the marine ecosystem, due to the dumping of waste plastic products in the
oceans, whose main cause is due to an increase in the production of manufactured
articles based on plastic resins, worldwide, where almost all manufacturing sectors have
included this type of raw materials in their industrial processes.
Continuing, BollaÃn and Vicente (2020) estimated an annual production volume of 400
million tons of plastic products, including food storage utensils, hygiene articles, toys,
the automotive industry, whose manufacturers have introduced polyethylene,
polystyrene, PVC, polypropylene, PET and other similar, as part of the resources that
are part of tubs, containers, doors, drawers, pens, covers, sanitary supplies, packaging,
computer cases, car parts, whose waste, in 80% of the cases, rest in the sea.
In view of this assertion, the UN (2021) urged countries not to neglect the activity of
recycling waste plastics, especially because in the year 2020 there was a greater
manufacture of plastics, but the recycling of their waste was reduced, because the
pandemic led to increased production of gloves, masks and other inputs for personal
protection against COVID-19, doubling the use of goods manufactured based on these
resins, which went from 52 to 110 tons per day of processing in Tehran and 1.470 tons
per month in Singapore, to give practical examples that allow us to perceive the problem
of contamination with these solid wastes that, according to the same entity, at least 70%
of them will go to the oceans.
Although the recycling of plastic products has been promoted for more than 30 years,
however, Vidal et al. (2021) points out that more than two thirds of plastic cannot be
recycled because they are difficult to reuse in industry, which weakens solid waste
management. Consequently, plastic waste accumulates in the form of garbage, which is
first expelled into the soil, but as erosion progresses, it reaches the mangroves and the
seas, where this waste is consumed by some marine species that do not metabolize it
and become intoxicated, maximizing the mortality rate of some aquatic species, in
addition to invading the natural habitat of different varieties of birds, fish and other
animals that live or depend on the seabed.
On the other hand, the construction industry was one of the most affected during the
pandemic, not only because of the fall in demand, but also because several of the inputs
used in this economic sector, increased their costs, some even doubled their prices, as
in the case of rolled steel coils, which increased their costs by 129%, while other steel