On Earth, there are seven species of sea turtles. Of those seven species, six species are classified as threatened or endangered. Three of those seven species are critically endangered. The seven species consist of green, hawksbill, loggerhead, kemp ridley, olive ridley, flatback, and leatherback sea turtle.
Regarding the question: why the sea turtle population is decreasing, there are six main types of threats in their life. There are six main threats that sea turtles face.

Fishing lines and shrimp nets, two of the main threats, can accidentally get these reptilians entwined in them. Next, the illegal trade of eggs and meat affects the population of sea turtles as well, due to people loving them as a delicious meal.
Adding on, coastal housing development is a problem regarding the turtle’s nest, decreasing the turtle survival chances even more. Beach houses are hot in real estate right now, so the construction of houses in a nice location instead of preserving an endangered species is concerning to how the human population thinks.
A commonly known threat, plastic, is harmful to the environment and also to our friendly sea turtles. For instance, some sea turtles think that plastic grocery bags are jellyfish, but those aren’t the appetizing treats they hoped for. Instead, all types of plastic harm, and have the potential of killing them.
Global warming, a hot topic around the world right now, can affect the coral that the turtles munch on.
The final threat: the trading of turtle shells. Their shells can be turned into many possessions, such as sunglasses and handbags. If you want to take action to save these endangered species, click here to find out more ways you can help.