
Working on the Soil and Water Conservation merit badge helps Scouts learn about things like erosion, watersheds, aquifers, water pollution, and water treatment. They also learn about the importance of plants in soil and water conservation.
Printable helps for requirements:
Printable requirements for Soil and Water Conservation Merit Badge
Printable checkoff sheet for Soil and Water Conservation Merit Badge
Printable note sheet for Soil and Water Conservation Merit Badge
And here are some more ideas and related achievements for the Soil and Water Conservation merit badge:
Soil Sample Cupcakes Recipe

Scouts always enjoy playing with their food! This would make a nice snack for any den meeting based on one of the ecology lessons.
Nature and Environment Troop Program Feature for Scouts BSA Troops

The Nature and Environment theme focuses on plants, wildlife, and how we interact with nature. The program feature includes some general information and some more specific ideas for meetings:
Splash! Scouts BSA Nova Award (Science) Helps and Documents

Splash! is the Scouts BSA Nova Award for investigating water science. To earn this award, Scouts must complete one of their science related merit badges and learn about related topics such as pollution, health, water cycle, and waste treatment. Scouts also learn how water is processed and consumed.
Let It Grow Scouts BSA Nova Award (Food and Agriculture Science) Helps and Documents

Let It Grow is the Scouts BSA Nova Award for investigating agriculture science. To earn this award, Scouts must complete one of the merit badges related to raising livestock or growing crops. Scouts will learn about where their food comes from and explore topics like weather, seeds, and microorganisms.
Science Program Feature for Scouts BSA

The Science troop program feature encourages Scouts to ask and investigate questions about the world. They learn how to form a hypothesis and test it.
Project Planning Program Feature for Scouts BSA Troops

The Project Planning feature helps youth leaders learn how to accomplish their goals, whether that be a service project or a troop campout or planning other activities together. The troop does a group exercise of planning and carrying out a recycle regatta.
Scouts BSA World Conservation Award: Helps and Ideas

Scouts BSA earn this award when they earn conservation related merit badges and participate in a conservation project as part of an approved Scouting program totaling at least three hours that addresses a conservation need common to more than one country .