Social entrepreneurs – people who create start-up companiesthat would help the environment, health care or agriculture – are on the rise.These entrepreneurs use innovationto tackle important economic and social problems.They can be for-profit or non-profit entities.Funding for social entrepreneurs is increasing.This is coming from foundations, institutional investors and individuals.Kiplinger is a personal finance publication in Washington, D.C.It reported that the amount of assets in socially responsible investing– focused on companies doing good in the world – almost doubled,from $3.74 trillion in 2012 to $6.57 trillion in 2014.Globally, interest in socially responsible investing is growing even faster.The 2014 Global Sustainable Investment Reviewsaid that between 2012 and 2014,global assets rose to $21.4 trillion from $13.3 trillion– an increase of 61 percent.The Schwab Foundation for Social Entrepreneurship,in Geneva, Switzerland, is an exampleof a foundation that advances social entrepreneurs around the world.Each year, working with the World Economic Forum,the foundation searches the globe "for outstanding social innovators,with business models that are proven to drive socialand environmental change," said their website.Getting rich is not the primary aim of social entrepreneurs.Instead, their focus is on fulfilling their mission to improve society."While profits are ideally generated,the main aim is not to maximize financial returns for shareholders,but to grow the social venture and reach more people in need,"said the Schwab Foundation website.Usually, social entrepreneurs reinvest their profits in the enterprise to expand it.Kristin Groos Richmond is co-founder of Revolution Foodsand one of the social entrepreneurs selected by the Schwab Foundation.Her company, in Oakland, California,is dedicated to providing fresh food, prepared daily, for families and schools,and is active in 11 states across the U.S. and Washington, DC.Richmond said social entrepreneurs are driven by their values.She gave the following advice to aspiring social entrepreneurs:"Align yourself with a team, a board and investors who believe in your mission."Many social entrepreneurs create novel solutions to solve world problems.Bart Weetjens, a Belgian social entrepreneur, is an example.He kept rats a childhood pets,then realized they could be put to work detecting land mines.He founded the non-profit organization APOPO in 1997.APOPO has used specially trained rats on leashesto clear more than 13,200 unexploded bombsfrom minefields in Tanzania, Mozambique, Angola and Cambodia,according to the National Geographic.APOPO uses African giant-pouched rats,which are huge, cat-sized rats native to central Africa.They have "an extraordinary sense of smell," said the National Geographic.The rats are lightweight enough to walk across the mines without setting them off.And their sensitive noses can sniff out explosives buried in the ground,even decades after a war has ended.In addition, many business schools – both in the U.S. and other countries– now offer courses in social entrepreneurship.The Wharton School at the University of Pennsylvania is an example.It is ranked by US News & World Reportas one of the nation's top business schools.Wharton Online offers a five-week class on social entrepreneurship,four to six hours a week, through Coursera, a global e-learning platform.Graduates of the course receive a certificateand "learn how to develop, test and deployhigh-impact solutions to society's toughest problems,"according to Coursera's website.Social entrepreneurs have also won increased media attention.For example, Forbes showcased "30 Under 30"– the top social entrepreneurs younger than 30 from around the world.One honoree, Sejal Hathi, age 25,was a molecular biology student at Yale,who sought to help girls globally.She founded Girltank (www.girltank.org), a for-profit start-up,to identify and develop girls with potential to be high-impact leaders.The website refers to it as "the she lab for social entrepreneurship." "Girltank creates a virtual tankfor young women interested in social entrepreneurshipto utilize the collective genius of the group to brainstorm ideas and solutions,crowd-sourcing funding for their ventures,and receive peer-to-peer mentoring," according to the website.