suggest two local and two national consequences of the problem of change in land and sea usage which poses a threat to biodiversity.

Local Consequences:

1. Loss of Local Species: Changes in land and sea usage can lead to the destruction of habitats, which can cause local species to become extinct. This loss of biodiversity can disrupt local ecosystems, affecting other species and potentially leading to a cascade of extinctions.

2. Impact on Local Economy: Many local economies depend on biodiversity for their livelihood, such as tourism, fishing, and agriculture. Changes in land and sea usage can disrupt these industries, leading to economic hardship for local communities.

National Consequences:

1. National Food Security: Changes in land and sea usage can impact the availability and diversity of food sources. For example, overfishing or deforestation can lead to a decline in fish stocks or crop diversity, threatening national food security.

2. National Health Risks: Biodiversity loss can increase the risk of disease outbreaks. Many medicines are derived from biodiversity, and the loss of certain species could limit the discovery of new treatments or cures. Additionally, changes in ecosystems can create conditions that are more favorable to the spread of certain diseases.