* Increased nutrient loading from sewage treatment plants, stormwater runoff, and agricultural activities has led to algal blooms and eutrophication.
* Increased sediment loading from logging, construction, and other land use activities has reduced water clarity.
* Increased water temperature from climate change and urban development has stressed aquatic life.
Air quality degradation
* Vehicle emissions, wood burning, and other sources of air pollution have contributed to poor air quality in the Lake Tahoe Basin.
* Air pollution can cause respiratory problems, heart disease, and other health issues.
* Air pollution can also damage plants and animals.
Loss of habitat
* Development, logging, and other land use activities have destroyed or degraded important wildlife habitat.
* Loss of habitat can lead to population declines of native species.
Invasive species
* Invasive species such as Asian clams, Eurasian watermilfoil, and quagga mussels have been introduced to Lake Tahoe and have caused ecological damage.
* Invasive species can compete with native species for food and resources.
* Invasive species can also alter the food web and disrupt the ecosystem.
Climate change
* Climate change is causing the temperature of Lake Tahoe to increase, which is stressing aquatic life.
* Climate change is also causing the snowpack in the Sierra Nevada to decline, which is reducing water supplies for Lake Tahoe.
* Climate change is also increasing the risk of wildfires in the Lake Tahoe Basin.
Human development
* The population of the Lake Tahoe Basin has grown rapidly in recent decades, which has put a strain on the environment.
* Human development has led to increased water consumption, wastewater generation, traffic congestion, and air pollution.
* Human development has also increased the risk of wildfires, floods, and other natural disasters.
Recreation
* Recreational activities such as boating, fishing, and hiking can damage the environment if they are not managed properly.
* Recreation can also lead to noise pollution, litter, and traffic congestion.
Tourism
* Tourism is a major industry in the Lake Tahoe Basin, but it can also have negative impacts on the environment.
* Tourism can lead to increased traffic congestion, air pollution, and water consumption.
* Tourism can also damage the natural beauty of the Lake Tahoe Basin.