Final answer:
The deteriorating global environment, characterized by climate change and the increased use of pollutants, is the trend with the most significant consequences for future community nutrition practice due to its impact on food security and health.
Step-by-step explanation:
Among the social or economic trends that have significant consequences for future community nutrition practice, the deteriorating global environment stands out. This includes climate change, the degradation of topsoil, and the increased use of chemical pollutants. These environmental changes threaten the stability of food systems and the ability to produce nutritious food, leading to increased food insecurity and the potential exacerbation of health-related inequalities. The impact of a declining environment on food production and the availability of nutritious options necessitates a shift in global food systems and compels a stronger emphasis on sustainability and nutrition education within community nutrition practices.