Her organisation 1 Million Women has a following of more than 800,000 people worldwide. 

In 2017 she was awarded conservationist of the year. Her organisation has won a number of awards from the United Nations for behaviour change. 

But Ms Isaacs has not always been a climate leader. The former cosmetics manager was once feeding the consumer beast of cheap, fast, highly packaged products. 

Speaking in Ballarat on Wednesday night, she said it was a realisation of her power as one individual that triggered the beginning of her journey for change. 

More than 40 women and one man walked away from the event at The Healthy Hub Wellness Centre on Wednesday feeling they too held power as individuals to make change. 

THE 1 MILLION WOMEN JOURNEY 

Before launching 1 Million Women in 2009, Ms Isaacs was far from a climate activist. 

She was producing cosmetics that were wrapped in lost of plastic packaging with some products that had micro-beads. 

"I could talk about climate change around the dinner table… but I used to think it was someone else's issue. I never really understood we are the change makers," she said. 

"There was a deep disconnect between being aware and then translating that to daily life. I thought climate change was too complex and too far away from my life." 

You can listen to Natalie's speech in Ballarat below. 

In 2006, Ms Isaacs said she had an epiphany. It was a time where the public conversation around climate change was shifting. 

"For me the thing that changed me forever was when I got my household electricity consumption down by 20 per cent just by shutting things off around the house," she said. 

"That small act changed my life forever. I looked at that and thought 'oh my gosh, I am really powerful'. What if millions and millions of us did that one thing - what a difference we would make.  

"Then I went on and got our household food waste down by something massive like 80 per cent just by thinking a bit differently. Then I started taking a breath before I bought something and asked 'myself do I really need it?'.

"Before I knew it from these small things I actually changed my life. I took ownership of the issue and I realised I was powerful and the things I did shaped the world.

"And so, as you do, I launched a women's movement on climate change. I wanted to tell women what had just happened to me."

At the time of launching, it was a proposition to reach one million women to build a lifestyle revolution to fight the climate crisis, by focusing on the choices we make in our daily lives. 

1 Million Women focuses on household energy, food waste, sustainable fashion, transport and economic power, providing bite sized actions with tangible results. 

The focus on women came from research that showed women make between 70 and 80 per cent of the consumer decisions that affect the household's carbon footprint. Women are powerful consumers and can use that power in the marketplace. 

Now more 880,000 women and girls are part of the 1 Million Women movement. Last year the organisation's blog was read 4.5 million times and its social media organic reach was 49 million. 

1 Million Women is one of the top 10 finalists for a global award on behaviour change that is set to be announcement by the United Nations in coming weeks. 

"It is about doing everything we possibly can in our lives to be a part of the solution to climate change," Ms Isaacs said. 

THE POWER OF LIFESTYLE CHANGE 

1 Million Women released the results of a survey leading up to the federal election revealing 90 per cent of women said they were worried about climate change and were doing something in their lives to change. 

Ms Isaacs said she was shocked by results that showed one in three women aged 18 to 39 said they were reconsidering having children or having more children. 

"I did not see that coming. I did not think that would be the answer. It really shook me," she said. 

"This is hard and it is personal. Changing the way we live is the elephant in the room. It doesn't get talked about. 70 per cent of global emissions come from our households. It is a big piece of this we can all be part of. 

"But it is really hard to change the way we live because we are trying to do it in this structured framework of a high consumption society."

"One of the things I have learnt through 1 Million Women and seeing thousands of women change the way they live, I think to truly and profoundly and honestly change the way we live we need to fall madly and deeply in love with the earth. We need to love it like our family and our friends. When we love it at that level, changing the way you live becomes a much easier proposition.

"You realise everything you do shapes the world. Once you feel that in your heart, it makes it so much easier." 

The strategy of 1 Million Women is to promote bite sized actions that create the momentum through tangible reward. 

It could be saying no to a plastic straw, refusing to buy a packaged product, saying no more one use plastic take away at lunch or taking your keep cup every time you buy a coffee. 

New members are encouraged to take a carbon challenge, with tips for daily activities to reduce carbon emissions. 

The website's blog and social media pages provide inspiring tips for small change.

"These little things are actually massive because they move you along, make you feel empowered. One action leads to another. It builds your confidence and helps you find your voice," Ms Isaacs said. 

"You should never underestimate the power you have as one person. Just think of the difference we would make if entire populations bought less stuff or we reduced our food waste by 50 per cent, or we left over packaged goods on the shelf to gather dust, or we shared more, drove our cars less. If all of us were doing it it really shifts the system. 

"If one million households in Australia got their electricity consumption down by 10 per cent, it would be responsible for shutting down two coal fired power stations.

"We can change this. We are having conversations about it. We are all doing something about it. The shift is happening and that's exciting. I hope you are feeling it too."

Ms Isaacs ended her speech in Ballarat by reading from her new book Every Women's Guide to Saving the Planet.

"Don't go down the road of feeling guilty. Make action and empowerment your new plan. Start small, really small.

"The secret of lasting behaviour change is to do something, see a result, feel empowered by it, repeat." 

"Never ever think you are not powerful. For each one of us, everything we do shapes the world." 

The 1 Million Women App will be available to download in three weeks. 

Visit 1millionwomen.com.au for more. 

The Ballarat event was organised by Grampians Central West Waste Resource and Recovery Group.