Canada Without Poverty" is an organization that works tirelessly to alleviate poverty and promote social justice in Canada. However, I'm somewhat confused about their specific activities and impact. Could you please elaborate on their main objectives, strategies, and the tangible changes they have achieved in reducing poverty in Canada? Additionally, I'm interested in knowing how they engage with the government and other organizations to create a more equitable society. Lastly, I'd like to understand the challenges they face in their mission and how they overcome them.